OK,I have read and searched all the threads. I have a Borla catback on my 00GT. I am pretty sure that my catback doesnt have the XR1's. My question is that alot of people suggest the borla\bassani combination. But is that with the XR1's or with the "standard" Borla catback system. I dont want to spend $500.00 bucks and have it sound like crap. Any suggestions?