Thread: How many HP's

if u multiply the horsepower of the car at the crank/flywheel by 20% then take that value and subtract it from the inital horsepower number, that'll give u what the actual horsepower is at the wheels; plus or minus a few hp since every car is different.
for example, a GPGT is rated at 200HP, so 200*0.20=40, now take that value and subtract it from 200. so it'd be 200-40=~160fwhp. savvy? lol

I always heard a 25% loss through the drivetrain. But that may be old school stuff. And with new oils and what not, the number may be different. But none the less, the drivetrain does take a lot of HP away.

And even still, an air filter, down pipe, cat removed, etc isn't going to help all that much. My guess is around 175 HP at the wheel as your car sits.