Cobb Hatch 3in Catback Exhaust - 2011-2014 Subaru WRX Hatch / 2008-2014 STi

The Cobb Stainless Catback: The Sound Your GV/VA WRX/STI Deserves

The Cobb 3-inch Stainless Steel Cat-Back Exhaust for the 2011-2021 Subaru WRX/STI (Hatchback fitment) is a mandrel-bent stainless steel system designed to free up the exhaust restriction downstream of the catalytic converter and give the GV/VA WRX/STI the exhaust note it should have come with. The 3-inch piping supports Stage 2 and Stage 3 power levels without becoming the restriction in the exhaust system.

3-Inch Mandrel Bends — No Crimping, No Restrictions

Every bend in the Cobb catback is mandrel-bent — a process that maintains the full 3-inch internal diameter through the curve rather than crimping the pipe as press-bending does. Each crimped bend creates a restriction that robs exhaust velocity. The Cobb system maintains consistent flow from the downpipe connection to the tips, supporting the exhaust gas velocity that a modified GV/VA WRX/STI needs to perform.

Bolt-In at Factory Hanger Locations

The Cobb catback connects at the factory downpipe flange and bolts to the factory exhaust hanger locations on the GV/VA WRX/STI (Hatchback fitment). No custom fabrication, no welding, no modification to the chassis. The polished stainless tips exit at the factory cutout location for a clean, finished appearance.

Key Features

• Platform: 2011-2021 Subaru WRX/STI (Hatchback fitment)
• Material: 304 Stainless Steel — durable, mandrel-bent throughout
• 3-inch piping — supports Stage 2 and Stage 3 power levels
• Mandrel-bent throughout — full internal diameter maintained at every bend
• Bolt-in at factory connection points — no chassis modification required
• Accessport tune required after installation

Fitment Notes

• Platform: 2011-2021 Subaru WRX/STI
• Hatchback-specific fitment — does not fit sedan
• Accessport tune required after installation — do not run on stock ECU calibration
• Connects at factory downpipe flange — verify downpipe connection compatibility

Straight From Subispeed

The Cobb catback is the exhaust we recommend for any GV/VA WRX/STI build — the 3-inch mandrel-bent stainless steel construction supports power levels well beyond Stage 2 and the sound character is aggressive without being obnoxious on the street. It connects at the factory flange so it pairs with any Cobb or aftermarket downpipe without an adapter.

What's Included

• Cobb 3-inch Stainless Cat-Back Exhaust — 2011-2021 Subaru WRX/STI (Hatchback fitment)
• All gaskets and hardware

About Cobb Tuning

Cobb Tuning has been developing performance parts and tuning solutions for Subaru vehicles since 1999. Based in Austin, Texas, Cobb built their reputation on the Accessport — the most widely used Subaru ECU tuning device on the market — and expanded that into a full ecosystem of intake, exhaust, drivetrain, and engine bay accessories engineered specifically for the platforms they support. Every Cobb product is developed in-house and validated on their own test vehicles before it reaches customers. Subispeed carries the full Cobb catalog because their engineering standards and platform-specific development process consistently produce parts that work exactly as advertised.