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Punisher Performance Reaper EFILive Autocal w/Switch | 2004.5-2005 Chevy/GMC Duramax LLY 6.6L

  • Includes DSP5 switch for Shift-on-the-Fly tuning
  • 5 power levels - up to +110HP
Please Call for Availability


This Punisher Performance Reaper EFILive AutoCal comes pre-loaded with 5 custom tunes for your 2004.5-2005 Chevy/GMC Duramax LLY 6.6L diesel and includes a DSP5 switch which allows you to shift-on-the-fly through the 5 power levels.

Clean, efficient power makes the Reaper your best choice for custom tuning!

Power Levels

Tune Level/Switch PositionHP Output Gains

Other combinations available, please call, chat, or email us for questions and needs.

This unit will also allow us to correct your speedometer to read correctly for oversize tires, read and clear trouble codes, and display real time data from your truck.

WARNING! These products are capable of disabling emissions equipment. If using DPF/EGR removed tuning, these high performance products are intended SOLELY for offroad use or closed-course racing use.

Shipping Information

  • Item Requires Shipping
  • 3.0 lbs.
  • W9.0000” x H7.0000” x L5.0000”
  • Free Shipping