AFAIK, none of the nsx's have straight cut gears (except maybe the first one). The black nsx is an nsx-r conversion owned by Vancehu on prime, and I'm pretty sure the red and white nsx's are on prime as well. None of them have straight cut gears from waht I know.
Also, my mr2 is a summer weekend only car that's going to see alot of track days, if I want a lower profile, I have a beater civic and an acura TL to drive around.
Also, I never said that small block chevy's and civics with fart cans sound the same. I just said that both fall into the lower spectrum of pitch. I forgot another low pitched group - boxer engines (ie. scoobies with huge cans). None of the civics have "f1" style exhausts in my area anyways, most have those low, rumbly farting exhausts. I don't particularly dislike the sound of a small block v8, if I had a vette or camaro that's how I'd want it to sound. I just don't think it suits a car like the mr2.
And yes, I hate those civics that drive at WOT at 3am with an extremely loud fart can down my street. I have a parking lot in my backyard (there's a church behind my fence) so I get big ricer parties behind my house all the time.
I usually hear things like this (maybe a little deeper):
http://www.youtube.com/watch?v=yDJwn5jl1og