XForce Varex Valved Cat Back Exhaust Black Tips 2011-2021 WRX Sedan / STI Sedan | 3" Mandrel-Bent | Valved Performance Exhaust
Overview
The XForce Varex Valved Cat Back Exhaust is a high-performance exhaust system designed specifically for the 2011-2021 Subaru WRX and WRX STI Sedans. This 3-inch mandrel-bent cat-back system enhances exhaust flow and sound control, offering Subaru enthusiasts the ability to tailor their exhaust note from refined street tones to aggressive, throaty rumble with the integrated VAREX valved muffler. It’s ideal for drivers who want both daily drivability and spirited performance sound on demand.
Engineered with precision, the system features a brushed 304 stainless steel construction for durability and corrosion resistance. The inclusion of flex bellows at the front absorbs engine movement, reducing stress on the exhaust components and improving longevity. The cast stainless steel Y-piece with the XFORCE logo transitions smoothly from a single 3-inch pipe to twin 2.5-inch pipes, balancing flow and sound while delivering a commanding rear-end appearance with quad 4-inch black tips.
Tested extensively on Subaru VA STI (EJ25) and WRX G3 S2 (EJ25) platforms, this exhaust system offers a 10% greater volume variation compared to previous models. The valved muffler allows drivers to switch between a street-friendly tone and a louder, more aggressive exhaust note, enhancing the Subaru boxer engine’s signature sound. This versatility makes it a perfect upgrade for WRX owners seeking both performance gains and customizable sound.
Features & Specifications
This XForce Varex Valved Cat Back Exhaust is engineered for 2011-2021 Subaru WRX and STI Sedans and features a 3-inch mandrel-bent stainless steel construction with a valved muffler for adjustable sound levels. Constructed from brushed 304 stainless steel, it delivers durability and optimized exhaust flow for Subaru enthusiasts seeking a versatile performance exhaust upgrade.
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Brand: XForce
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Product: Varex Valved Cat Back Exhaust Black Tips 2011-2021 WRX Sedan / STI Sedan
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Part Number: ESSWRX14VKBK
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Fitment: 2011-2021 WRX / STI Sedan
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Material: Brushed 304 Stainless Steel
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Finish: Brushed Stainless Steel with Black Quad 4" Tips
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Construction: Mandrel-Bent with Flex Bellows and Cast Stainless Steel Y-Piece
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Origin: Not Specified
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Power Gains: Optimized Exhaust Flow for Potential Power Improvement
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Tuning Required: Recommended for Maximum Performance
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Sound Control: VAREX Valved Muffler with 10% Greater Volume Variation
Key Benefits
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Performance: Enhanced exhaust flow with 3" mandrel-bent piping improves power delivery and throttle response.
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Sound Control: VAREX valved muffler allows on-the-fly adjustment between aggressive and street-friendly exhaust tones.
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Durability: Brushed 304 stainless steel construction and flex bellows reduce stress and resist corrosion for long-lasting reliability.
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Fitment: Designed specifically for 2011-2021 WRX and STI Sedans ensuring precise fit and easy installation.
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Aesthetics: Quad 4" black tips provide a bold, aggressive rear appearance that complements Subaru’s sporty styling.
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Adjustability: Slip joint clamps and included hardware allow for seamless installation and fitment customization.
What's Included
- 1× Centre section with Hot Dog resonator
- 1× Cast stainless steel Y-piece rear section with XFORCE logo
- 2× VAREX valved rear mufflers
- 1× VAREX remote key fob
- 1× Key fob receiver unit
- 1× 3" slip joint clamp
- 2× 2.5" slip joint clamps
- 4× Nuts & Bolts
- 1× 3" 2 bolt gasket
- 2× 2.5" gaskets
Installation & Compatibility
Installation of the XForce Varex Valved Cat Back Exhaust is moderately complex due to the valved muffler electronics and multiple slip joint connections. While the system is designed for bolt-on fitment on 2011-2021 WRX and STI Sedans, professional installation is recommended to ensure proper alignment, secure mounting, and correct wiring of the VAREX valve controls. Basic hand tools and a lift or jack stands are required. Tuning is recommended to maximize performance gains and ensure optimal engine management with the new exhaust flow characteristics.
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Professional Installation: Recommended
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Modifications Required: None beyond standard bolt-on installation
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Verify Compatibility: Confirm fitment for your specific model year and trim level within 2011-2021 WRX/STI Sedan range
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