Cool Lexus, but it doesn't seem like good flow characteristics were of any importance to them because that intake plenum sucks!
On the other hand, that must be the most rediculously crazy sounding M3 I've ever heard. Usually, they sound like crap IMO, but that one was nuts! First I thought the video was in fast forward because of the sound, but damn!
meh. they didn't really show what the car could do.
and as for the intake plenum, i think they just wanted as large of a reservoir of air as possible. the pipes probably all flow great, and the runners of the ITBs probably flow amazingly. it does seem that there would be some weird resistance from the exposed screws around the TB openings. i dunno. i'm not an aeronautical engineer. too much math.
i like the dodge diplomat burnouts on the bottom of that page.
bleh for the BMW. just not a fan. sounds nice, though.