COBB Tuning Stainless Cat Back Exhaust – 2011-2014 Subaru WRX/STI

Cobb Stainless Cat-Back Exhaust with Quad Tips — 2011-2014 Subaru WRX / STI

The Cobb Stainless Cat-Back Exhaust with Quad 3.5-inch Tips for the 2011-2014 Subaru WRX and STI adds four exhaust tip outlets to the stainless cat-back system. The quad tip configuration provides a distinct rear-end visual statement alongside the improved exhaust flow of the Cobb stainless system.

DETAILS

• Platform: 2011-2014 Subaru WRX and WRX STI
• Material: 304 stainless steel — mandrel bent throughout
• Tips: quad 3.5-inch stainless tips — four outlets at the rear diffuser
• Improved exhaust flow vs factory system
• Aggressive sound character tuned for the WRX/STI platform
• All hangers, gaskets, and hardware included
• NOTE: Ships via UPS/FedEx — signature required at delivery

Quad 3.5-Inch Tips: Visual Statement and Flow Improvement

Cobb’s stainless steel cat-back exhaust uses mandrel-bent 304 stainless steel tubing throughout — mandrel bending maintains consistent tube diameter through bends rather than collapsing the inner radius, which eliminates the flow restriction that crush-bent exhaust tubing creates. The smooth, consistent bore from the cat outlet to the exhaust tip allows spent gases to exit with minimal turbulence and backpressure. The reduction in backpressure has a direct effect on turbocharger performance: lower exhaust backpressure means the turbocharger can spool more freely, reaching boost targets faster and maintaining them with less effort from the engine. The stainless steel construction resists the corrosion and scaling that degrades factory and lower-quality aftermarket exhaust systems over time.

Sound Character and Complete Installation Hardware

The quad tip configuration exits four 3.5-inch tips through the rear fascia opening, creating a visual statement that sets the WRX and STI apart from stock. The four-outlet arrangement is not merely cosmetic — the larger combined tip area reduces exhaust backpressure at the tip exit, complementing the stainless mandrel-bent construction of the rest of the system. The aggressive visual presence of four exhaust tips suits Stage 2 and above builds that benefit visually from a rear end that communicates the level of modification.

What’s in the Box

• Cobb stainless cat-back with quad tips
• All hangers, gaskets, clamps, and hardware

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system — not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The Cobb quad-tip stainless cat-back for the 2011-2014 WRX and STI is for owners who want the Cobb exhaust system’s performance improvement with the most visually aggressive rear end treatment available. Four 3.5-inch tips make a statement that the build takes performance seriously — the correct companion to an intercooled, Accessport-tuned WRX or STI.

Fitment

Year	Make	Model	Notes
2011-2014	Subaru	WRX	EJ255 MT
2011-2014	Subaru	WRX STI	EJ257 MT