if you're not particular about noise and good hp gain, practically you can go to any exhaust shop. i think whole setup may cost you about RM 400 to 500. As compared to famous exhaust shops that may cost you RM500 just for a header.
probably the less popular version of R34 compared to a normal BNR34, V-spec, V-SpecII or even the Nur. But the the total number exist worldwide is only 163 and only 1...