pace said:
It's a high-flow with a 3" inlet and outlet (I think). I don't know who makes it but TurboXS did tell me that it is the same cat used in several other aftermarket systems. It resides in the mid-pipe section after the downpipe, and the O2 sensor is relocated to a post-cat position.
-Pace
It tapers down to the stock pipe size!
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Why does TurboXS Exhaust taper the exhaust?
1. PV=nRT What the........? Ideal Gas Law. In order to keep exhaust gas pressure low, you need more volume where the exhaust gas is hottest and as the exhaust gas cools it requires less volume.
2. We knew that some of you would want dual tips, coffee cans and that ours would be too quiet. The original or any muffler designed to replace the factory WRX's will work with our system.
3. Because we could!
4. It made the most power!