My friend had his unrecirc. on his rwd det, it was very loud, but everytime he revved it up it stubled to stay alive when it went back down to idle, and it ran very rich, plenty of black smoke...Nismo91ser said:PHAT car. Why is it that all the RWD cars that have the SR20DET swaps that i see have a unrecirc BOV and they have no drivability concerns??? Somebody key in on this??? Sorry about subject change but i noticed he had a unrecirc'd BOV!!!