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3" pipes definitely louder

May 18 2017 at 7:33 PM
trz1000  (Login t_zwick)

Response to RE: mellow at idle and cruising (no drone). But has some volume at WOT.

I read somewhere all else equal 2.5 to 3" is around a 10db increase.

I've never actually measured with a decibel meter to verify but I have gone from 3" on a 390 x pipe in a 68 galaxie to 2.5 with an x and the same mufflers and it made it much more user friendly.

Headers were different, hooked full length with the 3" and FPA shortys with the 2.5".

Didn't notice any performance difference but it was a mild ~300hp build.

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