Home - Return to Previous Page
Click on image to zoom

Big Gun Rev Box 40-R21

Enhances the power curve and adds 2 horsepower
Designed to increase your RPM limit by approximately 1,000 RPM depending on the model of your machine
Rev Boxes are remapped with a built in timing curve which provides noticeable horse power & torque gains
An easy plug-n-play installation
Not Available
Was: $159.99
Sale: $143.12
Save: 11%
Save: $16.87


Product Series


  • 40-R21
  • 40-R21
  • Big Gun
  • Temporarily Not Available
  • New


Product Series

Shipping Information

  • Item Requires Shipping
  • 1.1 lbs.
  • Free Lower 48 Shipping over $75!

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.