TurboXS STI08-TBE GT Series Turboback Exhaust System with High-Flow Catalytic Converter

The TurboXS STI08-TBE GT Series Turboback Exhaust is a complete post-turbo exhaust solution engineered for the 2008–2012 Subaru STI and 2011–2012 WRX 5-Door Hatchback. Designed with style, sound, and performance as top priorities, this system replaces every component from the turbo outlet to the bumper exit for maximum exhaust flow and an aggressive tone.

The system begins with a 4-inch bellmouth downpipe constructed from mandrel-bent T304 stainless steel, which tapers smoothly to 3-inch piping for optimized laminar flow. It transitions through a 3-inch high-flow catalytic converter and a 3-inch midpipe, terminating in a quad-outlet muffler with four polished stainless steel tips — two 3.5-inch tips per side — styled to complement the STI's rear valance.

Key Features:

• Complete turbo-back system: single inlet, quad outlet (split rear exit)
• 4-inch mandrel-bent T304 stainless steel bellmouth downpipe tapering to 3 inches
• Included 3-inch high-flow catalytic converter for street-legal emissions compliance
• 3-inch intermediate mid-pipe for unrestricted exhaust flow
• Quad polished stainless steel tips — dual 3.5-inch tips per side
• OEM-style doughnut gasket for enhanced flexibility, durability, and sealing
• 304 stainless steel construction throughout for corrosion resistance and longevity
• Dyno-developed on an in-house AWD Dynapack dynamometer
• TIG welded and polished to a show-quality finish

Part of TurboXS's GT Series lineup, this turboback exhaust system is built to deliver meaningful power gains over the restrictive factory exhaust while maintaining a refined, street-appropriate appearance. The high-flow cat version (STI08-TBE) keeps the vehicle emissions-compliant, while the large-diameter piping supports significant power levels. UPC: 053176487328.