2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Exterior Upgrades

Home

GM Duramax

2020-2025 GM 2500HD/3500HD Performance Parts and Accessories

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Exterior Upgrades

2020-2025 6.6L Silverado & Sierra 2500HD/3500HD

Bed Liners

Bed Racks

Bull Bars

Bumpers

Fender Flares

Grilles & Grille Guards

Mud Flaps

Roof Racks

Side Steps

Tonneau Covers

FREE SHIPPING ON ALL
ORDERS OVER $70

PRICE MATCH GUARANTEE

BUILD NOW, PAY LATER
FINANCING OPTIONS

30-DAY RETURN SATISFACTION GUARANTEE

DIESEL TRUCK EXPERTS STANDING BY

2020-2025 6.6L Silverado & Sierra 2500HD/3500HD

Power Lift Shop All

If you've already added on powerful performance mods to your 2020-2025 GM 2500HD/3500HD 6.6L Duramax, it's time to take it's style and functionality to the next level with some premium exterior upgrades. At Alligator Performance, we offer a wide range of aftermarket exterior parts, including side steps, fender flares, grilles, mud flaps, and roof racks, all designed to enhance both the look and utility of your GM Sierra or Silverado 2500HD/3500HD. Whether you're looking to boost your truck's rugged aesthetic with bold fender flares or improve its practicality with a durable roof rack, we have the perfect upgrades to set your truck apart from the crowd. Combine these accessories with some Lighting Upgrades and Suspension Components to create a fully customized, adventure-ready truck that looks as tough as it performs. GM Duramax Fitments: 2020, 2021, 2022, 2023, 2024, 2025 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.

Side Steps
Fender Flares
Mud Flaps

Can We Help You Find Something?

Give us a call: +1-208-719-7400

Chat With Us

The Garage

Welcome to The Garage – your one-stop shop for all your car care and maintenance needs. From premium oils and filters to top-notch car care products, we have everything you need to keep your vehicle running smoothly and looking its best. Whether you're a DIY enthusiast or a professional mechanic, our carefully curated selection of high-quality products will help you take care of your ride like never before.

Shop The Garage

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Exterior Upgrades

2020-2025 6.6L Silverado & Sierra 2500HD/3500HD

Bed Liners

Bed Racks

Bull Bars

Bumpers

Fender Flares

Grilles & Grille Guards

Mud Flaps

Roof Racks

Side Steps

Tonneau Covers

Loading products...

AMP Research 74841-00A BedXtender HD Max | 2019-2025 GM Silverado/Sierra 2500HD/3500HD

AMP Research 74831-01A BedXtender HD Sport Sport Bed Extender - Black | 2019-2025 GM Silverado/Sierra 2500HD/3500HD Without MultiPro Tailgate

Front Runner KRCS008T ReTrax XR 6'9" Canopy Slimline II Load Bed Rack Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

BedRug BRC20LBMPK Classic Bed Liner | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 8ft Bed with Multi-Pro Tailgate

BedRug BRC20LBK Classic Bed Liner | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 8ft Bed w/o Multi-Pro Tailgate

BedRug BRC20SBMPK Classic Bed Liner | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 6.5ft Bed with Multi-Pro Tailgate

BedRug BRC20SBK Classic Bed Liner | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 6.5ft Bed w/o Multi-Pro Tailgate

Truxedo 1274016 Pro X15 TS Soft Roll Up Truck Bed Tonneau Cover w/ T-Slot Rails | 2020-2025 Chevy Silverado/GMC Sierra 2500HD/3500HD 8' Bed w/ MultiPro Tailgate

Truxedo 1273716 Pro X15 TS Soft Roll-Up Tonneau Cover w/ T-Slot Rails | 2020-2025 Chevrolet Silverado/GMC Sierra 2500HD/3500HD 6.10ft Bed w/ Multipro/Flex Tailgate

Truxedo 1273316 Pro X15 TS Soft Roll-Up Tonneau Cover w/ T-Slot Rails | 2020-2025 Chevrolet Silverado/GMC Sierra 2500HD/3500HD 6.10ft Bed w/o MultiPro Tailgate

Truxedo 1272816 Pro X15 TS Soft Roll-Up Tonneau Cover w/T-Slot Rails | 2020-2025 Chevrolet Silverado/GMC Sierra 2500HD/3500HD 8ft Bed

AMP Research 74608-01A BedXtender HD Quick Mount Bracket Kit | Universal

Rugged Liner FC-C6720 Premium Soft Folding Cover | 2020-2021 GM Silverado/Sierra 2500HD/3500HD 7ft Bed w/o Factory Side Storage Boxes

Rugged Liner WWC20HD Wheel Well Rear Inner Liner | 2020-2025 GM Chevrolet Silverado 2500HD/3500HD SRW

Rugged Liner C67U20HD Under Rail Bedliner | 2020-2025 GM GMC Sierra/Chevrolet Silverado 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes

Wehrli 100459 Lower Splash Shield Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P

Wehrli 100446 3/8 inch Bumper Spacer Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

BedRug BRZSPRAYON Spray-In Adhesion Kit for BedRug Liners & Mats | Universal

WeatherTech 38211IM ImpactLiner Bed Mat | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

AMP Research 96255-01A PowerStep Vision Running Boards | 2024-2025 GM Silverado/Sierra 2500HD/3500HD

AMP Research 74612-01A Bracket Kit w/o Multipro Tailgate | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Rough Country A-G12011-GPA Defender Fender Flares (Dark Slate) | 2020-2025 GM/GMC Sierra 2500HD/3500HD

Rough Country A-G12011-GLT Defender Fender Flares (Dyanmic Blue) | 2020-2025 GM/GMC Sierra 2500HD/3500HD

Rough Country A-G12011-GJI Defender Fender Flares (Dark Sky) | 2020-2025 GM/GMC Sierra 2500HD/3500HD

FREE SHIPPING ON ALL ORDERS OVER $70

PRICE MATCH GUARANTEE

BUILD NOW, PAY LATER FINANCING OPTIONS

30-DAY RETURN SATISFACTION GUARANTEE

DIESEL TRUCK EXPERTS STANDING BY

2020-2025 6.6L Silverado & Sierra 2500HD/3500HD

Can We Help You Find Something?

The Garage

Follow us

CUSTOMER SERVICE

INFORMATION

TOP CATEGORIES

FREE SHIPPING ON ALL
ORDERS OVER $70

BUILD NOW, PAY LATER
FINANCING OPTIONS