Got to tune it, I have those in my 91 SI hatch with a SIR swap and 370CC RCs. My Vtec is 5900 due to the primary power range. I love them. Vtec crossover is insame, with a Blox maniflod and Blox 76MM TB. had to buil my head, All supertech. I am running the spec 4 in my built LS Vtec.