Working closely with our partners from Whipple superchargers, an all new massive 3.8L supercharger was developed for the GT500 platform! The new supercharger boosts the capable 5.2-liter V8 to over 900 horsepower. The twin screw supercharger system is equipped with a larger throttle body, cold air intake, updated pulley system and innovated dual core dual pass intercooler. Although optimally, the GT500KR is run on 93 octane or above, the 50 state emissions legal system runs happily on 91 pump gas