Well, dont quite understand the complaints on here, because I have had the ABSOLUTE OPPOSITE happen to me. I have installed a magnaflow to my bassani x pipe without hassle, and BEAUTIFUL i might add both in appearance and sound. I have installed a CB on a focus sedan, again no problems, and just recently on a Jetta 2.0 with again no problems. Many makes and models, same quality every time. I have had NUMEROUS compliments on the sound and I enjoy it the most.