just put one on my sohc s13. it has a deep tone, VERY loud, no raspiness at all. it comes with a silencer inside, which was a b*tch to pull out. i would not suggest this for a daily driver, its obnoxiously loud, even with silencer in. i can barely hear my subs anymore(2 12"!!!!!!). the fitment was perfect, everything lined up no problem. 80mm btw.