oh i see now, i misunderstood. i dont have my blow off valve on the hot pipe, it is on the throttle pipe on my car. as far as the hot pipe goes, i have never seen a heavy throttle or enjuku hot pipe up close so i cant say they are the same or not. in any case, you have an S14, you do know if you are putting in a S13 engine which i am assuming you are, the other pipe to the throttle body will not fit if you use an S14 i/c kit. it will have to be modified or another one will have to be made.