2020 GMC Sierra 1500 AT4 LPE Supercharger Package

Truck

Oct 10

Project Overview

This 2020 Sierra 1500 AT4 arrived with a forged L87 built by Golen Engine—ready for boost. We installed a Magnuson 2650 supercharger system, LT4 fueling, and a Trifecta-unlocked ECM, then dialed it in on our Mainline Hub Dyno for a 217 HP gain.

Specs
      Platform:     2020 GMC Sierra 1500 AT4
      Engine:       L87 built with forged pistons and rods.  Compression ration 10.0:1
      Drivetrain:   Stock 10 Speed
      Brakes:       Stock
      Wheel/Tire:   Stock

    

      Audio & Connect:Stock
      Interior:     Stock
      Baseline:     Est. 350 HP / 383 dFtLb
      Final Output: 567 HP / 484 dFtLb
      Dyno:  Mainline ProHub Dyno
    

Engine, Induction, & Fueling

The customer-supplied 6.2L L87 came from Golen Engine with forged pistons and rods, lowering compression to 10.0:1. KTR installed a Magnuson 2650 Supercharger System from Lingenfelter Performance Engineering, paired with LT4 injectors, a high-pressure pump, and a Nick Williams 103mm throttle body. The ECM was unlocked by Trifecta Performance, allowing full calibration and boost control.

After careful calibration on our Mainline Hub Dyno, this Sierra gained 217 horsepower at the wheels—transforming it from refined truck to torque-rich performer with factory drivability intact.