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Hi
Understand most exhausts fitted on production line start wide then narrow towards the rear. to keep exhaust note quiet the idea is to have your tail pipe a next size pipe down from the cat pipe as exhaust gases by then have lost speed and sound waves change. narrower pipe helps keep up velocity so gases exit quicker. big fart cans serve no function other than noise to hey look at me. have been on internet and exhaustpartsuk have a speical resonater to fit tail pipes to control noise. basically can size with a perforated tube that fit inside it. idea is to break up any sound waves with no loss of performance.
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