Sign In
Get Help
Cart
White 2021 GMC 3500HD L5P Duramax outfitted with a full suite of Banks Power towing upgrades.
Banks Insider, Banks Ram Air, Boost Tubes Upgrade Kit, Chevy/GMC, CoolRunner Oil Pan, Diff Cover, Duramax, Exhaust, Fan Focus, iDash, MAP Sensor Spacer, Monster-Ram/High-Ram Intake, PedalMonster, Ram-Air Transmission Pan, Stealth Pod, Tuner

Customer Converts to Banks: 2021 GMC 3500HD Upgrades

“Bragging rights,” Michael says with enthusiasm. “That’s the feeling of having Banks on your truck. I cannot say enough about the quality of the products installed on my 2021 GMC 3500HD. I mean, they’re completely impressive. I have the Derringer Tuner, dual iDash Data Pro gauges, Stealth Gauge Pod, PedalMonster, Monster Exhaust, Monster-Ram Turbo Inlet, Ram-Air, MAP Sensor Relocation Kit, AirMouse, Ram-Air Differential Cover, and Boost Tube Upgrade Kit. Installation was easy with both written instructions and top-notch instructional videos.”

White 2021 GMC 3500HD L5P Duramax outfitted with a full suite of Banks Power towing upgrades.
Michael’s 2021 GMC 3500HD outfitted with a full suite of Banks Power upgrades for heavy towing.

“I can’t say enough about the responsiveness and power these upgrades have made to my truck, especially while towing my 39′ fifth-wheel. Merging into faster moving traffic with a 16,000 pounds trailer was a bit lackluster. And an unexpected bonus was a bump in fuel economy. I was getting an average of 16.8 mpg, but with all of the Banks upgrades, I’m averaging 20.9 mpg. An increase of 4.1 mpg is amazing! I’m getting almost 700 miles between fuel stops. I also went from one regen per tank to one regen per tank and-a-half.”

Dual Banks iDash DataMonster and SuperGauge installed in a Stealth Pod on the A-pillar of a GMC 3500HD.
Monitoring EGTs, boost, and Derringer power levels with dual iDash gauges in a Stealth Pod.

“Before this experience with Banks, I ran Bully Dog on my trucks, so naturally, I went to them the first. When I found out they didn’t have any products for this model year, I went searching the web and found Banks. The more I looked into the company and the man behind it, the more impressed I became. I made the informed decision that Banks was the way to go and ordered everything available. There was no reason to look anywhere else. Gale and his products are the real deal!”

Banks Ram-Air Differential Cover installed on the rear axle of a GMC 3500HD, showing the patented air scoops.
The patented Ram-Air Differential Cover actively cools gear fluid while towing heavy loads.

“Not only are all the products exceptionally made, but they are aesthetically pleasing—and add a little sexiness! I have to tell you, I am chopping at the bit to order the new CoolRunner Oil Pan and Ram-Air Transmission Pan next!”

The Science Behind L5P Duramax Performance Upgrades

Towing a 16,000-pound fifth-wheel places immense thermal stress on the L5P Duramax engine. Upgrading the factory intake tract with the Ram-Air system and Monster-Ram Turbo Inlet significantly reduces pumping losses and improves volumetric efficiency. By flowing colder, denser air into the engine, exhaust gas temperatures (EGTs) remain lower under heavy load. The Derringer inline tuner safely optimizes fuel delivery based on this increased air density while continuously monitoring vital engine parameters via the OBD-II port. Furthermore, the Ram-Air Differential Cover utilizes patented air scoops to ram cool air through directional heat radiation fins, preserving gear oil viscosity and preventing thermal breakdown during long, steep grades.