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

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

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Bed Liners

Bed Liners

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Bed Racks

Bed Racks

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Bull Bars

Bull Bars

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

Bumpers

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Fender Flares

Fender Flares

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Grilles & Grille Guards

Grilles & Grille Guards

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Mud Flaps

Mud Flaps

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Roof Racks

Roof Racks

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Side Steps

Side Steps

2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Tonneau Covers

Tonneau Covers

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AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal

AMP Research

AMP Research 19-04280-STA Replacement Controller Module | Universal

SKU: AMP19-04280-STA
$99.99
AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD
AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD
AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD
AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD
AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD

AMP Research

AMP Research 76254-01A Powerstep Electric Running Boards Plug N Play | 2019-2022 GM Silverado/Sierra 2500HD

SKU: AMP76254-01A
$1,799.99
Cognito 110-91193 Front Fender Liner Tie Back Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD
Cognito 110-91193 Front Fender Liner Tie Back Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Cognito

Cognito 110-91193 Front Fender Liner Tie Back Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: COG110-91193
$99.95
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal

AMP Research

AMP Research 76404-01A OBD-II Splitter | Universal

SKU: AMP76404-01A
$119.99
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD

AMP Research

AMP Research 76255-01A PowerStep Running Boards | 2023-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: AMP76255-01A
$1,799.99
Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD
Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD
Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD
Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD
Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD

Ranch Hand

Ranch Hand GGC201BL1C Legend Grille Guard (Front Camera) | 2020-2023 GM Silverado/Sierra 2500HD/3500HD

SKU: RANGGC201BL1C
$912.74
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal

S&B Filters

S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal

SKU: SAB84-1001
$349
Husky 58286 Front and Rear Mud Guard Set | 2020-2025 GM Silverado/Sierra 2500HD/3500HD
Husky 58286 Front and Rear Mud Guard Set | 2020-2025 GM Silverado/Sierra 2500HD/3500HD
Husky 58286 Front and Rear Mud Guard Set | 2020-2025 GM Silverado/Sierra 2500HD/3500HD
Husky 58286 Front and Rear Mud Guard Set | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Husky Liners

Husky 58286 Front and Rear Mud Guard Set | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: HUS58286
$119.99
AMP Research 78254-01A Powerstep Extreme Running Board | 2019-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 78254-01A Powerstep Extreme Running Board | 2019-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 78254-01A Powerstep Extreme Running Board | 2019-2025 GM Silverado/Sierra 2500HD/3500HD
AMP Research 78254-01A Powerstep Extreme Running Board | 2019-2025 GM Silverado/Sierra 2500HD/3500HD

AMP Research

AMP Research 78254-01A Powerstep Extreme Running Board | 2019-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: AMP78254-01A
$2,199.99
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 FC-C6720 Premium Soft Folding Cover | 2020-2021 GM Silverado/Sierra 2500HD/3500HD 7ft Bed w/o Factory Side Storage Boxes
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 FC-C6720 Premium Soft Folding Cover | 2020-2021 GM Silverado/Sierra 2500HD/3500HD 7ft Bed w/o Factory Side Storage Boxes
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 FC-C6720 Premium Soft Folding Cover | 2020-2021 GM Silverado/Sierra 2500HD/3500HD 7ft Bed w/o Factory Side Storage Boxes

Rugged Liner

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

SKU: RUGFC-C6720
$329
Rugged Liner WWC20HD Wheel Well Rear Inner Liner | 2020-2024 GM Silverado 2500HD/3500HD SRW
Rugged Liner WWC20HD Wheel Well Rear Inner Liner | 2020-2024 GM Silverado 2500HD/3500HD SRW

Rugged Liner

Rugged Liner WWC20HD Wheel Well Rear Inner Liner | 2020-2024 GM Silverado 2500HD/3500HD SRW

SKU: RUGWWC20HD
$139
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes
Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes

Rugged Liner

Rugged Liner C67U20HD Under Rail Bedliner | 2020-2024 GM 2500HD/3500HD 6.9ft Bed w/o Factory Side Storage Boxes

SKU: RUGC67U20HD
$279

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

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