: So if you switch to either a catback that's straighter, straight-through or 3" you'll rock that dyno :)You shouldn't mix and match 3" catback with 2.5" piping from the rest of the exhaust. So if you want to have 3" exhaust you want to the complete exhaust to be 3" not just the catback. So if you already have 2.5" downpipes and test pipes, just switching to a straight 2.5" catback will make a huge difference because you just improved the exhaust velocity minimizing any turbulence.
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