Originally Posted by ElectricAL
With a 4-5 hp gain, you're basically adding the power of a lawn-mower (and not a rider, either), it certainly wouldn't hurt the 1/4 time, but it won't make a big difference, either. If I were to guess, I would guess maybe some hundredths of a second difference...
5 horse power is alot
You figure the best cold air intake will get you at most 10hp at a price of $250 so thats $25 per 1 hp VS the copper plugs which gives you $2.5 per 1 hp .. that's 10 times more bang for the buck
Its a no-brainer.
I can show you a dyno of your wallet before and after copper plugs vs cai