Hi,
just a thought. It should possible to improve car soundelectronically.no use of exhaust, pipe or whatever.
I don't know if such a system existsbut look:
take a electronic box with a speaker, a sensor takes the rpm from the engine and feeds intot the el. box. you can choice the sound you want v6,v8,tractor,indicar etc... theoutput to the speaker corresponds to the rpmof your engine becauseof the sensor. it is easy to double,triple the frequency if your engine turn slow, like a diesel . The speaker could be installed outside ,soyou may have a nice sound for your car. what do you think ?
cheers,
jp

 

I would reccomend using badstrats idea. run a 2.5" id pipe from your headers/manifold. after the axel run a 3" pipe. it sounds pretty sweet, but with a v6, your still gunna sound ricey at high rpms