When I replaced my Fiat 500 Abarth exhaust with a high flow coil and 2.5" exhaust system, it turned out to be VERY noisy. I mean, how noisy do you expect a race car to hit the track on a trailer, but I need an everyday car, and although the police don't issue loud muffler coupons where I live, the noise gets everyone on me I'm looking at a car, and since I also like speed a bit, I'll soon attract the attention of some law enforcement officer. So I cut 18 inches off my center tube and welded in…