I'm looking in to getting new intake for my 99 M3. right now it's bone stock. i have been looking at Dinan CAI ($450), K&N FIPK ($240), Conforti ($360), and AA ($350). They all seem to have similiar gains in Hp/ Tq, so my concerns now are the sound and the reliability. i don't want an intake that sounds like a ricer they all can

. will the different materials produce radically different sounds? any and all info will help. tx