I don't know if you already installed the Borla system or not. Back in February 2007 I installed mine. I had my mechanic do it for $ 75.00(In New York City Area) with the resonator, very easy to do. But the system was so quiet and I wasn't happy with it. I wento to an exhaust performance shop and I had the resonator removed for $ 200.00 and did in a way that if in the future if will get to loud I can put the resonator back, but I don't think is going to happen. I'm very happy the way the car sound and is not annoying or to loud for me. Hope this will help you with your decision, let me know which way you go, I'm curious.
Steven245