test pipe or high flow cat ?
#4
in general though, i'd choose a HFC over a test pipe because tests have shown that they perform just about the same, while the HFC obviously is better for the environment and doesn't stink as much either.
#6
Thanks.I've always replaced my cats with straight pipes on all previous cars and always passed emissions here in Wa. Its off my TDI, was off my S4, S60R, 911, older V8 Audi ans 900 Turbo. Was always told it was better for the engine. Never heard of HF cats before the s2k. Is the straight pipe that much louder?
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#9
Performance is going to be pretty much equal between a good HFC and a test pipe. If you don't have to do emissions, you can save a little money getting the test pipe.
I have a berk 70mm on an otherwise stock CR exhaust and I didn't notice any real difference in sound from the factory cat. I'd imagine you would notice a little increase in volume adding the HFC to a less restrictive exhaust.
I have a berk 70mm on an otherwise stock CR exhaust and I didn't notice any real difference in sound from the factory cat. I'd imagine you would notice a little increase in volume adding the HFC to a less restrictive exhaust.