Originally Posted by av3206
i am confused how come GM tells me i have 323 HP before upgrades i am new to all this...
GM quotes numbers for the engine at the crank shaft. Dyno numbers are taken at the wheels. All the stuff in between absorbs power so the wheel HP is always less.
Also, different dynos read different HP ratings even on the same engine... even from day to day. You can only compare readings taken from the same dyno to check if your mods actually gained HP.