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If you buy a downpipe for your car, it doesn't matter if it has a cat/testpipe or not. It will bolt right up to your existing 02 housing, there is another option you might consider. There is a downpipe that has a 02 eliminator on it. This means you don't have a 02 housing anymore, the downpipe just has a bung for your O2 sensor in it. Thats the exhaust I have and I like it. So 2.5" and 3.0", it doesn't really matter on how it bolt up to your car.
CRAIG
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