It has been proven, beyond any doubt whatsoever, that flame decals add 20-25 whp (wheel horsepower) to your vehicle, and of course even more bhp (brake horsepower). I know it’s proven because I read it on the Internet, and everything we read on the Internet is true, not #fakenews. Where did I read it? This incredibly informative blog entry here.
Not sure about the acronyms?
whp is wheel horsepower, measured at (duh!) the wheels. It takes into account power lost in the drive train, including the transmission and differential, as well as the alternator, air conditioning compressor, wheel mass, etc. It is measured by spinning the wheels on a dynamometer (dyno). In other words, whp is what matters.
bhp is brake horsepower, measured at the engine crankshaft (not at the brakes). The “brake” part of the term refers to the Prony brake, an early device used to measure power output. The bhp value is always higher than the whp value, because it is only measures gross engine output. These days, the bhp value is usually quoted as SAE net horsepower. Knowing bhp allows you to evaluate engines and engine modifications — not whole-vehicle upgrades like performance clutches, underdrive pulleys, light-weight wheels, huge spoilers, and of course, flame decals.