Killer B Motorsports Holy Header 4-1 Up Pipe 04-21 STI / 02-14 WRX / 04-13 Forester XT / 05-09 Legacy GT / 05-09 Outback XT | 321 Stainless Steel | Performance Up Pipe
Overview
The Killer B Motorsports Holy Header 4-1 Up Pipe is a high-performance exhaust component designed specifically for a range of Subaru models including the WRX, WRX STI, Forester XT, Legacy GT, and Outback XT. This up pipe replaces the restrictive factory unit to improve exhaust flow from the turbocharger, reducing backpressure and increasing turbo spool efficiency. It is ideal for Subaru enthusiasts looking to unlock additional power potential and improve throttle response while maintaining reliability under demanding conditions.
Engineered with precision, this up pipe features mandrel-bent 14-gauge 321 stainless steel tubing and CNC-machined stainless steel flanges. The design eliminates the need for a flex joint, a common failure point in OEM up pipes, ensuring a leak-free and durable connection to both the turbo exhaust housing and the exhaust manifold. Killer B Motorsports’ commitment to quality and fitment precision makes this product a standout choice for Subaru owners seeking a robust and long-lasting upgrade.
By upgrading to this 4-1 Holy Header up pipe, Subaru owners benefit from improved exhaust gas velocity and reduced turbo lag, which translates to better throttle response and increased power gains when paired with proper tuning. The use of 321 stainless steel ensures excellent corrosion resistance and durability in the harsh engine bay environment, making it a reliable foundation for further performance modifications.
Features & Specifications
This Killer B Motorsports Holy Header Up Pipe is engineered for Subaru WRX, WRX STI, Forester XT, Legacy GT, and Outback XT models. It features 14-gauge 321 stainless steel tubing with CNC mandrel bends and stainless steel flanges for precise fitment and durability. Constructed entirely from premium 321 stainless steel, it delivers enhanced exhaust flow and reliability for Subaru enthusiasts seeking improved turbo response and power potential.
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Brand: Killer B Motorsports
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Product: Holy Header 4-1 Up Pipe
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Part Number: U102-1
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Fitment: 04-21 Subaru WRX STI / 02-14 Subaru WRX / 04-13 Subaru Forester XT / 05-09 Subaru Legacy GT / 05-09 Subaru Outback XT
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Material: 321 Stainless Steel
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Finish: Natural Stainless Steel
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Construction: CNC Mandrel Bent Tubing, CNC Machined Flanges
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Origin: USA Sourced Materials
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Compatibility: Compatible with V-Band Flange
Key Benefits
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Performance: Improves exhaust flow and reduces turbo backpressure for faster spool and increased power potential.
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Durability: Made from thick 14-gauge 321 stainless steel to resist corrosion and withstand high temperatures in the engine bay.
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Fitment: CNC mandrel bending and machined flanges ensure precise, leak-free installation without the need for a flex joint.
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Reliability: Eliminates common failure points found in OEM up pipes, providing long-term durability for daily driving and spirited use.
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Compatibility: Designed to fit multiple Subaru turbocharged platforms, making it a versatile upgrade for various models.
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Quality: USA sourced materials and expert craftsmanship deliver a premium product built specifically for Subaru enthusiasts.
What's Included
- 1× Killer B Motorsports Holy Header 4-1 Up Pipe
- 1× Set of CNC Stainless Steel Flanges
- Installation instructions
Installation & Compatibility
Installation of the Killer B Motorsports Holy Header Up Pipe requires moderate mechanical skill and basic hand tools. It is a direct bolt-on replacement for the factory up pipe with no modifications necessary, thanks to the precise CNC mandrel bending and flange machining. Professional installation is recommended if you are unfamiliar with turbocharger exhaust components or lack access to proper tools. This up pipe is compatible with V-band flange connections and fits a broad range of Subaru turbocharged models as listed. Proper tuning is recommended after installation to optimize performance and ensure safe engine operation.
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Professional Installation: Recommended
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Modifications Required: None
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Verify Compatibility: Confirm fitment for your specific year and trim level before purchase
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