From my experiments with the car the biggest change was removing the resonator. I first change out the standard diff back exhaust with a sports exhaust and kept the standard tip. This made little difference to the sound. I then had the resonator replaced with straight pipe and kept the sports exhaust. I like the sound and it is still not too loud to attract unwanted attention. If you look under my car though the resonator is still there and the exhaust looks stock. Great work for all up approx $160.