Its the sound of performance, thats why.
Many of these kids have a rear mounted grapefruit thrower (thats a muffler) because it 'sounds good' and frees up 'hella horsepower.'
99 out of 100 dont even know what a cam does.
999 out of 1000 dont know what a cabourated engine sounds like either.
Its a safe bet they arent trying to imitate anything specific - aside from some of the fake blow off valve noise makers Ive seen.
Its loud, obnixious, and its a great way to show everyone during your morning drive to school how much of a hardass you really are.
I know this because my area is second only to LA county, as far as Im concerned, in ricers per capita. And I mean bad ricers... the duct tape, unpainted, maybe primed if they are lucky with 50 stickers for products they dont have kind of ricers.
The kind of ricers that pull up to a real sports car and dont even have the good sense to stop gunning their noisemaker so they can be heard 'talking smack.'
Spot Jenny from 4th period english class on the way to school? 'Hells yeah.' Give her some of that 80 decible bumble bee loving. BUUZZZZZ BUUUZZZZ BUUUUUUUUUZZZZZZ!!! Maybe Ill even get to second base tonight... awwwwww yeah! Yo Dawg... lets hit up Mickey D's (Ba da ba ba baaaa, Im lovin' it) Word, now lets go show that Z06 some VTEC POWA!