2020-Present Chevrolet Silverado 2500 HD

The T1XX platform made its way to GM's HD series trucks for the 2020 model year. With it came major upgrades inside, outside, and most importantly, under the hood. The base engine became a 6.6L LT-based V8 producing 401 horsepower. The 6.6L L5P Duramax is the line-topping diesel and provides 910 lb/ft of torque in stock form. No matter how you put your HD truck to use, we have the parts to make it perform better.

Air & Fuel Delivery

Holley is the source for your Air & Fuel delivery upgrades! From Carburetors to the latest in EFI Fuel Injection Systems and Fuel Pumps. We have your products from air cleaners to fuel tanks and everything in between. Sniper EFI has been leading the conversion to EFI for decades!
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Brakes

Going fast is always our goal, but having the support and power to stop your hod-rod is a must! At Holley.com we have you covered for Rotors, Pads, Master Cylinders, Big Brake Kits and all supporting accessories to improve how your car responds.
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Exhaust

Holley is home to some of the top-performance exhaust brands in the world. Brands like Flowmaster, Hooker BlackHeart, Hooker Classic, Flowtech, APR, Dinan, and Flowmonster combine to cover thousands of applications and a variety of budgets. Whether you are putting a full stainless steel exhaust on your late-model muscle car or if your rat rod needs a set of Lakester headers, Holley’s exhaust brands have you covered.
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Tuners & Programmers

Power tuning and programming in the palm of your hand! Available for GM, FCA, Ford, and more! Multiple power levels and monitoring parameters for your gas or diesel powered ride! The powerful and wide-ranging calibrations found in our handheld and in-cabin tuners are capable of increasing performance, improving drivability, increasing towing power, and even improving efficiency.
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Wheels

Horsepower is always top of mind, but making your ride look amazing is just as important! At Holley we have a wide variety of Wheels and Wheel accessories for your build. We have exciting brands like Shelby, HK, Halibrand, Rev and so much more! We also have you covered with lug nuts, wheel spacers, tpms sensors and any needed accessory to complete your set up!
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Edge Evolution CTS3

In-vehicle ECM/TCM unlock
Adds up to 125hp/275tq to the tires at Peak RPM's
Monitor displays important data like Soot, Miles Since Last Regen, EGT's, Boost and Fluid Temperatures
10-speed transmission tuning included, with choice of four calibrations to fine tune your experience (Economy, Tow, Performance, Extreme)
Throttle Boost feature allows user adjustable pedal sensitivity
Economy (50hp/100tq), Towing (75hp/160tq), Performance (90hp/180tq), Extreme (125hp/275tq) *Peak RPM Gains
1.3 seconds faster in the 1/4-mile, gained 8mph!
Remember last button setting for drive mode, exhaust brake, tow/haul, and grade braking
Calibrate speedometer for tire sizes 26-38"
Command manual DPF regeneration cycle
Allison Transmission Relearn
Adjust speed and rev limiters
Read and clear DTC's
Adjust Idle Up feature for 600-1800rpms
Great for daily driving and towing performance
Tuning has passed all in-house emissions testing with CARB EO submissions being processed
Calibrations developed to offer clean, efficient DPF friendly performance

View Evolution CTS3 with Locksmith

5 Power Levels Adjustable on-the-fly through smartphone app
Built in adjustable Throttle Booster gives you two devices in one
Peak to Peak gains as much as 63hp/140tq
Level 1 - 20hp/60tq, Level 2 - 30hp/80tq, Level 3 - 40hp/90tq, Level 4 - 50hp/110tq, Level 5 - 63hp/140tq
Warranty friendly with no need to flash the factory ECM, simply remove the device to return your truck back to 100% factory settings without a trace
7 User adjustable pedal settings in each power level via app
Cold Engine Protection feature keep factory power levels until engine has reached operating temps
Shaved .31-seconds in 0-60mph and gained 3mph in 1/4-mile testing
For added savings and control, look at our EZ + Insight CTS3 kit also available
50-State Compliant under CARB EO D-115-30

View EZ for 2024-2026 GM L5P Duramax

2020-Present Chevrolet Silverado 2500 HD

Edge Evolution CTS3

Flowmaster American Thunder Cat-Back Exhaust

My Garage: 2020-Present Chevrolet Silverado 2500HD