Burger Motorsports JB4 Tuner

The JB4 is a piggyback tuner. It plugs into two sensor connectors under the hood and changes the signals the factory computer sees, which raises turbo boost without rewriting the ECU. You control it from a phone over Bluetooth, and it unplugs in minutes.

why this one — Identical hardware and price to the Silverado listing, just ordered through Burger's own GMC Sierra page. Claimed up to 85 wheel horsepower and 120 wheel torque, reversible because nothing is written to the ECU, and realistically the main tuning path the 2.7L Turbo has. Not the choice if you want a permanent flashed calibration.