The 2011+ Subaru STI Cobb Tuning Catted Downpipe is fabricated from 302 stainless steel for added corrosion protection. 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. 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. 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.
- 2011+ Subaru STI Cobb Tuning Catted Downpipe
- Features high flow catalytic converter
- Made from 304 stainless steel
- 3" tubing
- Bell mouth design
- Features a polished finish