Bacically, he was saying don't use ricer math. 20hp plenum, 12hp pulley, 6hp Z tube and 7hp intake don't neccessarily add up to 45 gained HP. I have all of those and in cool weather/lowhunidity/sea level, average 6.4 sec 0-60 (before the pulley), which is on par with what FX45 owners are averaging @315hp, so 10 HP or so (likely more since my car weighs a few hundred pounds less than a '45) are lost in the math somewhere. It IS possible that I did gain 35-40HP, but still have a deficit on torque compared to the '45; it's all a balancing act. Anyway, if you want performance, you have to be wiling to pay for it, both out of pocket for the mod and at the pump. I wouldn't use gas milage as a determining factor, anyway. With the bolt-ons, the change in gas milage is negligable and if you drive normally, your milage shouldn't be THAT bad whith the blower. Decide what you want in terms of performance and go from there.