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The Invidia won't make any more difference than any other exhaust. I ran the Comptech with the S/C for a while, then put a test pipe on it a bit later. I wonder if the test pipe made more of a difference than the exhaust by itself (should make sense if you've ever looked inside a cat).
I eventually put it all back to stock for a multitude of reasons (noise, smell b/c of the test pipe, prefer sleeper look).
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