hey. i have a 96 3.5 and i have the same problem. the next step is to add a more free flowing exhaust. best would be to have a performance shop make u up an exhaust with mandrel bends, with the least amount bends if possible and of course a sport muffler. if its too much and if you know your mechanic well, like i do, go to a parts for trucks shop and pick up some mandrel bent pipe and make you own. that's what I'm going to do soon. and don't go too big cause bigger is not better unless you have a turbo or supercharger, just wasting money. 3" is the biggest i would go. the factory downpipes are really crushed in on our cars, i think mine are 2.25"