Quote:
Originally Posted by c_ozanich
I have a 4inch dp and berk mids (larger piping in both) and volume increased quite a bit...
As long as there's a good amount of back pressure maintaining high exhaust air velocity speeds, its going to get louder because of the volume of air the exhaust is releasing. The muffler suppresses the amount of air coming from the tips of the exhaust because of the channels/restrictor plates and fiberglass inside the main chamber. The muffler exhaust mod changes the "loudness" because its essentially a faux straight pipe going through the muffler, larger diameter pipe in there would produce a louder sound.
Either way, you'll be louder going with a race application as opposed to a street.
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I'd still say your volume increase has more to do with losing cats in your downpipes than pipe size.
Another example I have is when we changed the header on my friends 06 civic si. There was an increase in pipe diameter, but he got a header with a cat still. The exhaust tone and volume barely changed, if at all.