2 1/2" or 3"

dartcuda1 said
Look I am trying to be good hear HA ha HA saying that you wont use 450hp on the street.The engine dynoed at 715hp and 698ft of toque.The hp is way to much for the street also see why I am trying to keep it as quiet as passable.I want to see if someone sells a quiet in 3".They will be going in the stock location. Mark

3" for sure thats a whole bunch of power, to be honest with you thats 3½" territory,but hard to keep it quiet,if you had a fuelcell i would have recomended some very long 3"mufflers where the stock fueltank sits stock,over here we have a brand called apple racing mufflers and they have some very long 3"mufflers that with an X-pipe can keep a 470-500hp smallblock quiet enough that you would never even recognice it on the freeway as anything out of the ordinary,but still sounds very deep at idle,thats the only mufflers i can think of from the top of my head that i feel safe saying would keep 715hp fairly quiet while driving without loosing alot of power

superlite said
2 1/2 is fine for your application. The only time you need 3" is only if you were to exceed 500 CI. It has nothing to do with horsepower, it is called swept volume.

not to stirr the pot but are you for real? the more power you make the more burned air and fuel will exist the exhaust port and that ends up in the collector wich in turn ends up in the exhaust system for example a 600hp 340cui smallblock will lose a lot of power from using something small as 2½" exhaustpipes while at the same time a bonestock worn out 500cui caddilac engine wont gain anything worth caring about from a dual 3"system,its all about how much power you make, but keeping it quiet is a whole diferent game