all i need is good mufflers.

If you can fit them the hushpower mufflers made by Flowmaster work.

Every and I mean every car I've worked on, built, been in or around with flowmasters are the same. Loud inside, sounds great at idle, sound like **** under WOt or load. My local dyno and engine builder also did a test with them for a guy who swore by Flowmaster and the chambered flowmasters leave power on the table.