I added the door seals and would say the biggest impact was on wind noise and front tire noise:
http://f87.bimmerpost.com/forums/sho....php?t=1265176; you don't really lose any engine sound. I just did a 1000+ mile road trip and the difference is palpable and positive. Install is cake. The big
noise source (engine and exhaust are not noise to me) remaining in the cabin comes from the rear tires. As soon as ASD is off it's all you'll hear for a few days. You get used to it, but out on the highway it'd be good if it were 3 or 6 dB less. Part of it is from the trunk, but a lot seems to come from under the rear seat where a
quite a bit of sound deadening was removed. I kinda wish the 24 kg of material they removed was an option to add back (even if it were at cost).