thanks Danzeterna..
We got the quotation from Tan choon but we were lookin for any potong kereta guys here can offer us a good price .. any way we got it.. thanks for your comments and help.
cheers
Hey guys.
I tried using a ball bearing and spring-type boost controller, but the spike was way too high at 1.5 and the boost isnt constant. So my mechanic resorted to fish tank valves x2.