Gibson mufflers are flow-through, that is to say they are basically just a
straight piece of pipe with holes in it and a casing around that with some
minimal noise baffling, if your current exhaust is too loud the gibson will
be way too loud, a gibson is as close as it gets to having no muffler at all.
I run a 95 318 with Thorley headers and Y-pipe(3"), no cat, and a 3" gibson
exhaust system from the header Y. It is way loud, I have even gotten a ticket
for defective exhaust. I got out of the ticket but had to go to court to do
it (pain in the ass). I also dont think my neighbors appreciate my exhaust
note like I do.
John S
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