u want to match the motor. s14 front mounts will have the blow off valve stem along with the AICV. The BOV port will need to be blocked off.
s13 piping will work better.
I have the same thing you do..Kouki with s13 Blacktop.
i am using my HKS Type S from when i had my s13's. I had to do some trimming and such of the ends of the frame rail, but i actually got it to mount up using all the s13 brackets on the kouki.
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