the resonator is shorter than the stock cat section on the car. if you ever looked at the ss headers, you will notice they are longer than the stock manifolds. the headers were meant to work with the resonator, so you'll need some work to fit the resonator up to your stock system. a local muffler shop can probably custom make you a set of extending pipes for the resonator to fit your stock manifolds. you other alternative is the aa track pipe, which bolts right up, but is also more $$$. if you have anymore questions, feel free to email me, i can sell you either.