COBB Tuning 3" turboback exhaust for Subaru Impreza WRX/STI 2002-2007

• 304 Stainless Steel for Corrosion Resistance
• CAD Designed Cast Turbo Outlet for Maximum Flow
• Straight-through Optimum Flow Design
• Custom Spun Metal Substrate High Flow Cat
• Two O2 Bungs for Factory & Aftermarket Sensors

COBB turboback exhaust contains of:

1.Subaru SS WRX/STi/FXT 3" Downpipe - The COBB Tuning downpipe begins with the CAD designed bellmouth that directs the air coming out of the turbo. The design permits the air to flow with very little turbulence to the single high flow catalytic converter. This metal substrate cat is highly efficient, allowing the exhaust to flow much easier than the factory unit ever would. The engineering that went into the COBB 3" Downpipe started with the CAD designed investment-cast turbine outlet, made of 304 stainless steel for enduring corrosion resistance and reduced heat transfer to the engine bay. The shape of the outlet flange smoothly blends the turbine outlet and wastegate gases. The outlet flange is configured with an O2 sensor bung to accommodate the stock O2 sensor. A custom spun metal substrate high flow catalytic converter comes next. This one piece 400 grade stainless steel cat has a much higher flow rate and longer lifespan compared to ceramic or "brick" style cats. It also reaches operating temperature faster than other style cats for cleaner cold-start emissions. A second O2 sensor bung is located immediately after the cat to be used by the second OEM O2 sensor. All tubing used in the fabrication of this downpipe is 304 stainless steel for increased corrosion resistance. The end flange uses the stock donut gasket and factory spring bolts to aid in flex, longevity and proper fitment. This provides an improved seal compared to other methods, as well as reduced noise. An additional benefit is that it makes the COBB 3" Downpipe compatible with any cat-back exhaust that mates to the factory cat section.

2.Subaru WRX / STI SS 3" Cat-Back Exhaust - The COBB catback exhaust does not deviate from the factory emissions equipment and conforms to the SAE dictated 95-decibel exhaust noise level limit enforced by California, as well as other states in the US. This system is modeled after the stock exhaust fitment locations, therefore making it an easy direct bolt on item inclusive of all needed gaskets and hardware.