{"product_id":"grimmspeed-bb450-turbocharger-2002-2007-wrx-2004-2021-sti","title":"Grimmspeed BB450+ Turbocharger 2002-2007 WRX \/ 2004-2021 STI","description":"\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cstrong\u003eBolt-On Fitment. Serious Power. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMore power shouldn't mean tearing apart your engine bay. Meet the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGrimmSpeed BB450+\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, engineered to deliver substantial horsepower gains with a true bolt-on design that works with your existing factory-style components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTaking the place of our JB400, the BB450+ brings a new level of performance to our Subaru turbocharger lineup. At its core is a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eceramic ball bearing system\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, replacing the JB400's traditional journal bearing design for responsive power delivery and strong performance throughout the RPM range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe BB450+ features a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebillet 2618 aluminum compressor wheel\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eInconel 713C turbine wheel\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, paired with carefully engineered housings designed to support airflow, durability, and consistent performance under demanding conditions. An \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8cm turbine housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.77 A\/R compressor housing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e help deliver a combination of midrange torque and sustained top-end horsepower.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eWe've also completely redesigned the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ewastegate actuator\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, incorporating a billet aluminum body, dual-port design, and heavy-duty steel mounting bracket. Together, these improvements deliver more consistent wastegate operation, tighter boost control, and greater flexibility when dialing in your setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAnd the best part? \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eIt's a true bolt-on turbocharger.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The BB450+ retains the factory mounting location and is designed to work with stock-style connections and existing compatible supporting components. \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNo cutting, custom fabrication, or extensive modifications under the hood required.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Just a straightforward path to considerably more power.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhether you're replacing your factory turbo or taking the next step beyond the JB400, the BB450+ delivers the performance you're after without the complications of a custom turbo installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eQuick Specs\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eBearing System:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ceramic ball bearing\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCompressor Wheel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Billet 2618 aluminum\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCompressor Wheel Inducer\/Exducer:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 53.4mm \/ 67.4mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTurbine Wheel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Inconel 713C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTurbine Wheel Inducer\/Exducer:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 49.1mm \/ 56mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCompressor Flow:\u003c\/strong\u003e 61 lbs\/min\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCompressor Housing:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A356 aluminum\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCompressor Housing A\/R:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.77\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTurbine Housing:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e HiSiMo\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTurbine Housing Size:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 8cm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWastegate Actuator Material:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 6061 aluminum\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWastegate Base Pressure:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 15 PSI (default)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWastegate Mounting Bracket:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Straight, 6-gauge zinc-plated steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAdjustable Base Pressure Range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3–26 PSI with included spring combinations\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eBoost Control Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3-port and 4-port configurations\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eInstallation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Factory-location bolt-on; no cutting or custom fabrication required\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eDyno Testing: Putting the BB450+ to Work\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe put the BB450+ to the test against the factory VF48 and our previous JB400 turbocharger to see how the new design performs throughout the RPM range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTesting was conducted on a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMustang Dyno\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e using a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2020 Subaru STI\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e equipped with a built rod-and-piston engine, front-mount intercooler, 1300cc injectors, and E85 fuel.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: rgb(214, 31, 40);\"\u003eThe results speak for themselves.\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003ciframe title=\"VF48 vs JB400 vs BB450+\" aria-label=\"Line chart\" id=\"datawrapper-chart-T4JFy\" src=\"https:\/\/datawrapper.dwcdn.net\/T4JFy\/1\/\" style=\"width: 0; min-width: 100% !important; border: none;\" height=\"451\" data-external=\"1\"\u003e\u003c\/iframe\u003e\u003cscript type=\"text\/javascript\"\u003e(function(){function e(){window.addEventListener(`message`,function(e){if(e.data[`datawrapper-height`]!==void 0){var t=document.querySelectorAll(`iframe`);for(var n in e.data[`datawrapper-height`])for(var r=0,i;i=t[r];r++)if(i.contentWindow===e.source){var a=e.data[`datawrapper-height`][n]+`px`;i.style.height=a}}})}e()})();\u003c\/script\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBB450+ Dyno Results:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Wheel Horsepower:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately 485 WHP\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePeak Wheel Torque:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately 460 lb-ft\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHorsepower Gain vs. JB400:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately +90 peak WHP\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTorque Gain vs. JB400:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately +45 peak lb-ft\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eBut the real advantage becomes clear when looking beyond peak numbers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared to the JB400, the BB450+ delivers stronger horsepower and torque through much of the RPM range, with an increasingly noticeable advantage as engine speed climbs. At approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6,500 RPM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the BB450+ maintains around \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e480 WHP\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to roughly \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e370 WHP\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e from the JB400.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThat's a difference of approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e110 WHP at the same engine speed\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, demonstrating just how much more power the BB450+ carries toward redline.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe result is a turbocharger that combines substantial midrange performance with a considerably stronger top end, all while retaining the convenience of a factory-location, bolt-on design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cspan\u003e*Dyno results reflect the specific test vehicle, supporting modifications, E85 fuel, and tuning. Individual results will vary.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eStock Motor Testing: 93 Octane vs. E60\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eWe also put the BB450+ to the test on a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2013 Subaru STI with a factory stock engine\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, giving us a closer look at its performance on a more conventional setup. The vehicle featured a stock intake, GrimmSpeed Top Mount Intercooler, GrimmSpeed Equal Length Header, up-pipe, and catted downpipe.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"BB450+ 93 OCT vs E60 Blend\" aria-label=\"Line chart\" id=\"datawrapper-chart-j4Bhn\" src=\"https:\/\/datawrapper.dwcdn.net\/j4Bhn\/1\/\" style=\"width: 0; min-width: 100% !important; border: none;\" height=\"451\" data-external=\"1\"\u003e\u003c\/iframe\u003e\u003cscript type=\"text\/javascript\"\u003e(function(){function e(){window.addEventListener(`message`,function(e){if(e.data[`datawrapper-height`]!==void 0){var t=document.querySelectorAll(`iframe`);for(var n in e.data[`datawrapper-height`])for(var r=0,i;i=t[r];r++)if(i.contentWindow===e.source){var a=e.data[`datawrapper-height`][n]+`px`;i.style.height=a}}})}e()})();\u003c\/script\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eRunning on \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e93 octane pump gas\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the BB450+ produced approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e378 WHP and 338 lb-ft of wheel torque\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Switching to an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eE60 ethanol blend\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e increased output to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e420 WHP and 368 lb-ft\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, demonstrating the additional performance available with different fueling configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eBoth configurations demonstrated strong midrange torque and horsepower that continued building toward redline. These results offer a closer look at \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehow the BB450+ performs on a daily-driven STI with stock engine internals and select supporting modifications\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, highlighting its power delivery across different fueling configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eHow It Stacks Up: A Closer Look\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ciframe title=\"BB550+ vs BB500 vs BB450+\" aria-label=\"Line chart\" id=\"datawrapper-chart-mD1tq\" src=\"https:\/\/datawrapper.dwcdn.net\/mD1tq\/1\/\" style=\"width: 0; min-width: 100% !important; border: none;\" height=\"451\" data-external=\"1\"\u003e\u003c\/iframe\u003e\u003cscript type=\"text\/javascript\"\u003e(function(){function e(){window.addEventListener(`message`,function(e){if(e.data[`datawrapper-height`]!==void 0){var t=document.querySelectorAll(`iframe`);for(var n in e.data[`datawrapper-height`])for(var r=0,i;i=t[r];r++)if(i.contentWindow===e.source){var a=e.data[`datawrapper-height`][n]+`px`;i.style.height=a}}})}e()})();\u003c\/script\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eWhen compared directly against the BB500 and BB550+, the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBB450+ demonstrates its strength in earlier torque delivery and responsive midrange performance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. While the larger BB550+ ultimately produces greater peak horsepower, the BB450+ develops power sooner, delivering an impressive balance of acceleration and sustained horsepower throughout the RPM range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor STI drivers prioritizing \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eresponsive power delivery and a broad, usable powerband\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the BB450+ makes a compelling case.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eRedesigned Wastegate Actuator: Precision Boost Control\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe BB450+ features our newly engineered \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebillet aluminum, dual-port wastegate actuator\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, designed for smoother operation, more consistent boost pressure, and precise control throughout the RPM range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe also developed a heavy-duty mounting system using a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003estraight, 6-gauge zinc-plated steel bracket\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Unlike thinner, bent brackets that can flex under load, this rigid design keeps the actuator rod properly aligned with the wastegate arm, reducing the potential for binding, inconsistent boost pressure, and long-term bracket fatigue.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor greater tuning flexibility, each BB450+ ships with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e15 PSI base spring\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eadditional spring pack\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, allowing you or your tuner to adjust base pressure to suit your performance goals. An included reference chart makes selecting the proper spring combination straightforward.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe actuator's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edual-port design supports both traditional 3-port and advanced 4-port boost control configurations\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. With a compatible 4-port setup, pressure can be applied to both sides of the internal diaphragm for finer control and greater flexibility at higher RPM.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eFitments\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e2004–2021 Subaru STI\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e2002-2007 Subaru WRX\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eInstallation Note:\u003c\/strong\u003e The BB450+ is designed for direct bolt-on installation without cutting or custom fabrication. Proper ECU tuning is required to ensure safe operation and optimal performance. Additional supporting modifications may be necessary depending on your vehicle's setup and performance goals.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2 dir=\"auto\" aria-level=\"1\" class=\"fui-StyledText\" style=\"text-align: center;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/3165\/2402\/files\/BB450_and_BB550_Plus_Wastegate_Spring_Chart_1.pdf?v=1793653725\"\u003eBB450+ and BB550+ Wastegate Spring Chart\u003c\/a\u003e\u003c\/h2\u003e","brand":"Grimmspeed","offers":[{"title":"Default Title","offer_id":50835940311215,"sku":"GRM.1204.1.0","price":1999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/3598\/4815\/files\/GRM.12041.0-BB450_Turbo-1.jpg?v=1793979492","url":"https:\/\/subimods.com\/products\/grimmspeed-bb450-turbocharger-2002-2007-wrx-2004-2021-sti","provider":"Subimods.com","version":"1.0","type":"link"}