I just bought a set of autolite life time wires 7mm. about 39.00, plugs I like the stock ones like ngk,or bosch, no platinum junk, I have tried about every kind of plug and end up going back to stock, same with the wires, I wasted alot of money trying to find more h.p. but so far the k&n air filter and the 2" exhaust 30 wt oil with prolong added(that helped alot)and a wix oil filter and a gas additive for the crap gas they have nowadays, thats about it other than loosing all the weight you can from your rig be it tires or thinner rims, carpet ,ect.