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COBB SS 3" Catted Downpipe
- 2015+ STI
Ships for free in the 48 states
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 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.
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This Part Fits
2 customer reviews
Take this with your favorite cat-back exhaust and hear that boxer rumble. Definitely my favorite mod that I have put into my STI.
Awesome build quality, fit and finish is amazing!
This is the only down pipe I have so I can't compare them to the others out there. In my option, this product is well worth the money. Solid make product, fitment was spot. The high flow cat does allow some of that gas smell through so if you drive in traffic a lot high flow cats or cat less might not be for you. Installation is time consuming as you have to remove the intercooler and a lot of bolts and screws are hard to reach and harder to get leverage on. I was able to complete the install by myself but it toke almost a full 8 hours. I'm not a professional by any means, so if you are you'll probaly have a lot easier time. Hope this review was helpful!
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