I did quite a bit of research before ordering my Magnaflow exhaust for my BMW 645ci. I wanted a deep throaty sound like a pedigreed European car should sound without being disturbing or overly loud...and that's just what I got! The system is beautiful and the installation, according to my mechanic, was a thing of beauty. Engineered to fit perfectly. My only suggestion is that it would be great to have a little adjustment fo fine tune the placement fo the exhaust tips. One is slightly off, about 1/4-3/8 inches closer to the opening but we coudln't make any adjustment . Nobody will notice but me but that is the one slight thing I pichked up on. Great job!