more or less, i want something somewhat quiet (that noise on the freeway can either hurt your ears, or put you to sleep), but not ricey sounding. i've heard all three of these (HKS, Mugen, Skunk2) don't sound ricey, and give decent gains for the money paid.

price is an option here, but if the other 2 are too noisy/ricey sounding i will go the extra $300 for Mugen. Anyone have any idea how Mugen's sounds? A sales rep from InlineFour.com told me that it sounds like stock, but slightly louder.

i'm not in a hurry to buy (i mean hell, i gotta wait to see what my credit card bill says for my christmas spending), but probably in the next month or so.