Car: 1990 Honda Civic Engine: Sohc ZC Everything is stock, i recently changed ecu to a pm6 as the correct ecu wasn't in there. in fact i still don't know what ecu was in there because it had no markings or indications were all scratched off. Car is running better now but it still feels a bit slow to me, i've always wanted a boosted car so i thought why not but i need to know how to lower compression in my zc as well as to how much psi can i run on a daily basis, whether i can use an emanage to improve hp + set up overall. i thought about going NA but then i really would love to see this car boosted. Please advise.