what year accord do you have? in the 90-93 accords the EX header will gain just as much as the DC sports... been dyno proven... same results as the H22 JDM header and the DC Sports.. your wasting your money. also for a header you will not gain 10-15 horses even if you have an exhaust... maybe 3-4 at the wheels... i/h/e will maybe gain you 15whp if your lucky.