Collection: TurboXS
TurboXS has built a legendary reputation in the turbocharged import performance community since 1990, specializing in meticulously engineered exhaust systems, intercoolers, blow-off valves, and complete turbo kits for Japanese performance vehicles. With over three decades of experience developing aftermarket turbo accessories, TurboXS has become synonymous with Subaru WRX and STI performance, while also serving Mitsubishi Evolution, Mazda rotary, Hyundai Genesis, and other turbocharged platforms.
The TurboXS Exhaust Philosophy
Unlike generic universal systems, every TurboXS exhaust is dyno-developed on their in-house AWD Dynapack dynamometer to ensure measurable power gains and optimal exhaust flow characteristics for specific vehicle applications. All systems utilize fully mandrel-bent T304 stainless steel construction with TIG-welded joints and show-quality polished finishes that resist corrosion while delivering the distinctive boxer rumble Subaru enthusiasts demand.
Signature Exhaust Designs
Turboback Systems: Complete exhaust replacement from turbocharger outlet to exhaust tips, maximizing power potential by eliminating every restriction in the factory system. TurboXS turboback systems feature cast 304 stainless steel bellmouth downpipes that taper smoothly from 4" at the turbo outlet to 3" diameter throughout the remainder of the system, maintaining optimal exhaust velocity while minimizing backpressure.
Catback Systems: For enthusiasts retaining stock or aftermarket downpipes, TurboXS catback exhausts connect at the factory catalytic converter location using OEM-style donut gaskets that provide superior sealing and flexibility compared to inferior flex-joint designs. Full 3" diameter mandrel-bent piping flows seamlessly into vehicle-specific muffler configurations.
Stealthback Systems: Modular design allowing mix-and-match component selection—combine TurboXS downpipes, catalytic converter sections, and midpipes with either TurboXS mufflers or retain factory mufflers for subtle sound levels with maximum performance gains.
Comprehensive Subaru WRX/STI Coverage
2002-2007 WRX/STI (Bugeye, Blobeye, Hawkeye): TurboXS pioneered exhaust systems for these chassis beginning in 2002, developing their proprietary downpipe flange design that became an industry benchmark. Available with RFL (Really F***ing Loud) mufflers featuring dual 4" polished double-wall tips, or RMA (Rear Muffler Assembly) configuration with more conservative sound levels. Complete turboback, catback, and component options including catted and catless downpipes.
2008-2014 WRX/STI: Second-generation cast bellmouth downpipes with improved taper design and 100-cell high-flow catalytic converter options. Systems tuck tightly to chassis for clean appearance eliminating the "sewer pipe" look of competitors. Compatible with 2004-2008 Forester XT and 2005-2009 Legacy GT turbo models sharing the EJ platform.
2011-2014 WRX/STI Sedan: Chassis-specific systems addressing the unique exhaust routing requirements of the sedan body style. Deep authoritative boxer tone with rolled and flame-blued 4" tips. Available in catted or catless configurations.
2015-2021 WRX/STI: Designed for flat-flange downpipe connection (standard on TurboXS, Invidia, and other aftermarket downpipes). Adapter available for factory donut-gasket downpipes. Full 3" polished mandrel-bent tubing with aggressive sound tuning.
2022+ WRX: Latest-generation systems engineered specifically for the FA24 turbo platform with vehicle-specific blow-off valve integration.
Innovative Downpipe Technology
TurboXS revolutionized downpipe design with massive cast 304 stainless steel bellmouths providing smooth laminar flow from turbocharger turbine housing. Unlike competitor's pie-cut welded designs that create turbulence and potential leak points, cast bellmouths ensure consistent internal geometry and superior sealing at the critical turbo flange connection.
High-Flow Catalytic Converters: 100-cell or 200-cell metal matrix catalytic converters (depending on generation) flowing dramatically better than restrictive 600-cell factory units while maintaining emissions compliance for states requiring catalytic converters. Modular design allows swapping between catted and race pipe sections using the same downpipe.
Adapter Systems: Comprehensive selection of adapters enabling mix-and-match compatibility—mate 3" downpipes to stock 2.5" catbacks, connect OEM downpipes to 3" aftermarket catbacks, or integrate TurboXS components with other manufacturers' systems.
RFL Muffler Heritage
The legendary "Really F***ing Loud" muffler became an instant icon when introduced, delivering maximum volume for those who want their turbocharged Subaru heard blocks away. Straight-through design with minimal restriction allows full turbo spool and wastegate sounds. Titanium-tipped variants add exotic visual appeal with distinctive burnt titanium coloring.
For more refined applications, RMA (Rear Muffler Assembly) mufflers provide deep performance tone without excessive volume, ideal for daily drivers or states with strict noise ordinances.
Blow-Off Valve Innovation
TurboXS pioneered the modular "XS" blow-off valve platform allowing enthusiasts to configure their valve for different applications:
RFL Blow-Off Valves: Maximum atmospheric venting for that signature turbo "whoosh" sound. Capable of handling up to 35 psi boost pressure with dual Viton o-ring piston design preventing diaphragm failure common in OEM valves.
Hybrid Blow-Off Valves: 50/50 split between atmospheric venting and recirculation, providing audible turbo sounds while maintaining proper MAF sensor readings for smooth idle and drivability. Modular design allows conversion to full atmospheric venting with separately-purchased outlet components.
SML Hybrid Valves: Designed specifically for Mitsubishi turbocharger applications found on Evolution models and other platforms using Mitsubishi turbos. Soft spring design provides rapid response while handling high boost levels.
RBV Recirculating Bypass Valves: Fully recirculated design for OEM-like operation with upgraded reliability and flow capacity over factory bypass valves.
Mitsubishi Evolution Applications
2003-2007 Evolution VIII: Complete turboback and catback systems, high-flow catalytic converters, blow-off valves, and intercooler upgrades specifically engineered for the 4G63T platform.
2008-2015 Evolution X: Systems designed for the 4B11T engine with appropriate modifications for the twin-scroll turbo configuration and revised exhaust routing.
2008-2011 Lancer Ralliart: Turboback systems utilizing Evolution X-derived technology adapted for the detuned 4B11 turbo application.
Additional Platform Support
Mazda RX-8: Full 3" diameter rotary-specific system custom-designed for the unique characteristics of the Renesis rotary engine with tuned chambers and specialized muffler packing materials. Dual 4" blued tips with hardware for both stock catalytic converter or TurboXS 3" race pipe/high-flow cat applications.
Hyundai Genesis Coupe: 2.0T Theta engine turboback systems and front-mount intercooler (FMIC) upgrades addressing the factory's insufficient cooling capacity.
Kia Stinger GT: Hybrid blow-off valve designed as direct replacement for restrictive factory bypass valve.
Intercooler Technology
TurboXS front-mount intercooler systems dramatically reduce intake air temperatures on turbocharged applications where factory top-mount or side-mount intercoolers become heat-soaked under sustained boost. Bar-and-plate core construction with optimized end-tank design ensures consistent cooling efficiency across the RPM range.
Quality Construction Standards
Every TurboXS exhaust component undergoes rigorous quality control ensuring:
- T304 stainless steel construction throughout (superior to 409 stainless in corrosion resistance and high-temperature durability)
- Full mandrel bending maintaining consistent internal diameter through bends
- Precision TIG welding for leak-free joints and structural integrity
- Show-quality mirror polish finish
- 5-year warranty on all exhaust components
- Proper routing with integrated exhaust hanger locations matching OEM mounting points
Dyno-Proven Performance
Documented power gains include 20-35 horsepower and 15-25 lb-ft torque improvements on turboback-equipped WRX/STI applications, with additional gains when combined with TurboXS intake systems, intercooler upgrades, and blow-off valves. Systems are developed specifically for stock turbo applications with appropriate sizing for upgraded turbocharger builds.
The TurboXS Difference
With three decades of specialization in turbocharged performance, TurboXS understands the unique requirements of forced-induction exhaust systems—optimizing flow without sacrificing exhaust velocity, managing thermal expansion in high-heat turbo environments, and delivering the aggressive turbo sounds enthusiasts crave. Their component-based approach allows budget-conscious enthusiasts to upgrade gradually while maintaining compatibility across the complete TurboXS ecosystem.
When maximum turbocharged performance meets meticulous engineering and show-quality craftsmanship, the result is TurboXS—the choice of serious Subaru and import turbo enthusiasts worldwide.