Just drove the car home from the dealer. Fortunately the "BMW performance System"sounds about perfect, exactly what I was looking for. When I ordered the part I was handed a schematic of the system showing it had a resonator and muffler. When the actual part showed up it was without a resonator, some unusual "crimping", for lack of a better word, was in it's place along the forward plumbing. When I first started the car yesterday, inside the shop, had some other work going on, it caused me considerable concern...it was way too loud. However, outside and on the road, I consider it perfect. I guess what happened was I got a newer system, "And its new, deep, racing growl will be music to your high-performance-attuned ears." is a quote off of a BMW website. The tips are a little longer, bigger and nothing more than a single layer of chromed tubing. OK, that's enough but for $1449. plus install I think one should get all the info one can get if they are considering a BMW system.