I think they are electric. The back of the gauge only has 2 wires, and no vacuum nipple. I think it's specific only to S15's too. You can use the holder in S14's though, but you have to cut the top bit of the plastic to fit.
Hi all sifu, i got my e9 gsr 2 month back. i was wondering what is the original boost for stock evo9 gsr? because i see on the m7 EBC it show 1.18bar only. is it stock? and how much i can boost on stock car? i mean...
just want to share some info...went to kg melayu subang (EVO autoparts), saw 1 altezza halfcut with carbon fibre front bonnet, hid, tein abs, upgraded front caliper n disc rotor not sure wat brand..not sure the spec...