BMW on the E9X: "Eight separate throttle butterflies operate precisely and independently for amazingly quick throttle response." So it's got one per cylinder (I did the math myself! ). And no dipstick on the E9X (which was the reason for your "dipsitick" comment, right?) BMW is not claiming any performance improvement (at this time). So I'll skip it and spend the money on bourbon instead. Wait... I meant tankfuls of gasoline.
Or one used 528e. No performance improvement? For $2,500? Let me translate that for you: BMW: "How about you just GIVE us an extra $2,500 just because you like us, and we'll throw on a (thin) coat of high temperature (gold paint if you like, to make you feel better) paint on your exhaust manifolds. Deal?"
What was the question again?! Heh. I have to side with NTR on this one! He asks about an exhaust system, and (as usual) we run all over the place and start giving him lectures on drivers' training. WHAH! Please bear with us, Brother R, as we are a bit easily distract-HEY, LOOK! A CHICKEN!