Check out Squirrels forum! forums.thetoyz.com Check out Squirrels forum! http The ProLine Slipstream, unlike the other shells on the market, whether if it was planned or not, offers a ducted area that will help cool the motor. Sure, it looks cooler than stock and other offerings, but performance wise, having that area ducted right in front of the motor will aid in cooling to prevent thermal. Which is what this kit needs. Part numbers: 3312-30 You can get this shell at www.prolineracing.com …