the cogged belt idea... i never heard off until you said it... i googled it lol. and from the few things i could find... it is'nt really used. and hurts your s/c. and right now i have the cheap cone from autozone. so i guess i'll get a bigger cone to see if it changes the sound any. and my pulley size is a 3.4 and i want to get a downpipe/Plogg before i consider dropping to a 3.2... and i wouldn't be surprised if there was a video of that! lol, i might check youtube.
Woah easy with the pulley sizes chief, with a downpipe/plog combo and that 3.4" you'll probably still be getting KR as it is, a 3.2" is waaay out of your league. For reference I'm still getting KR even with my mods (although I still have to tune it so we'll see).