I had 3" Flowmasters, and they were Racecar loud!! Inside and outside. I have put on Dynomax Super Turbos, and MUCH better, much nicer sound but still noisy when you push the go-pedal. Very nice sound I think, a bit "beefy" sound, some drone, but like an Cadillac compared to the Flowmasters..
I think that big cubes, cam and compression, is hard to keep noise down with 3" exhaust or just 2 mufflers.
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