3 or 2.5? posted by Lyasou on April 02, 2013 at 02:53 PM
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affect the overall volume to a point where I noticed. When I purchased my 2.5" turbo back system originally from SPecialtyZ, I asked Greg what the quietest version would be. He told me a resonated H-pipe was the answer. I've been happy with the result.
I'm now using 3" downpipes and 3"-2.5" test pipes along with the same 2.5" resonated H pipe and 2.5" cat back.