i know i already asked...but i didnt really get the answer i needed...i did a search, but i didnt really get the answer i needed...so, i'm asking again! If i get the HKS Hiper cat-back, do i need to get a test pipe? I heard i did, but am not really sure. I know they make it for the 92-95 si, but im not sure if they make it for my vx. Will the one for the si fit my car? Please help for i need to order this as soon as possible!! thanks