Due to circumstances beyond our control, there may be delays in shipping. We are unable to offer refunds on shipping charges for late delivery during this time. Thank you for your understanding!

UltraPower GM / Workhorse 7.4L Vortec (454) Custom Tuning

UltraPower GM / Workhorse 7.4L Vortec (454) Custom Tuning


Order Shipment Notice: 

Most orders are shipped within 24 hours from the order date. Orders placed on the weekend or after cutoff on Friday, and orders placed on select holidays are processed on the next business day. Please see our shipping terms for more information.

Part# UP74

If you will be sending us your ECM for reprogram you do not need to select core charge but if you are wanting us to program and send you a computer you must choose the core charge.

UltraPower Programming


  • GM/Workhorse 7.4L Vortec Engine (L29 & L21)
  • GM Trucks with 7.4L Vortec Engine (L29 & L21)
  • Chevrolet & Workhorse Motor Home Chassis from 1996-2000 (L29 & L21)


  • Gains of 40-55 HP and 40-50 lbs TQ
  • Gains of 1/2 - 2 MPG
  • Downshifts less approaching hills

Write a review

Please login or register to review

 The state of California requires that this warning be posted for people purchasing products that reside in California.

WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

Not Legal for California Use

This product is not legal for sale or use in California on pollution controlled motor vehicles.

  • Views: 28503
  • Product Code: UP74
  • Availability: In Stock
  • $668.25
  • $495.00

Available Options