Those things usually have mufflers that make it sound like its taking a stuff, get a muffler that MUFFLES the noise.
I actually enjoy loud cars.
The louder the better.
My friend had a I6 engine which had a straight exhaust pipe from the manifold to the end, where it also had a coby, which actually increases the sound, as if a straight pipe wasn't loud enough.
It sounded like a V8, and you could hear it from about 5 streets over if he was just cruising.