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

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2020-2026 GM 2500HD/3500HD Performance Parts and Accessories

Bed Liners

Bed Racks

Bull Bars

Bumpers

Fender Flares

Grilles & Grille Guards

Mud Flaps

Roof Racks

Side Steps

Tonneau Covers

Availability

In Stock 7
Out of Stock 82

Manufacturer

Addictive Desert Designs 5
Agricover 1
AMP Research 14
B&W Trailer hitches 2
BAK Industries 3
BedRug 6
Bushwacker 1
Cognito 1
Edge Products 1
Husky Liners 1
Kleinn Automotive Air Horns 1
Lund 3
Putco 9
Ranch Hand 4
Rhino Rack 5
Rough Country 8
Rugged Liner 2
S&B Filters 3
Truxedo 4
WeatherTech 1
Wehrli Custom Fab 3
Westin 11

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Make

Chevrolet/GMC/GM 4
Ford/Chevrolet/GM/GMC/RAM/Dodge RAM/Universal 12
GM/Chevrolet 14
GM/Chevrolet/GMC 47
GM/GMC 11
GM/GMC/Chevrolet 1

Model

Sierra 11
Silverado 14
Silverado/Sierra 52

Year

2019-2022 1
2019-2025 2
2020-2021 3
2020-2023 7
2020-2025 61
2024-2025 3
Universal 12

Price

$2,998.98

Rating

0-1 70
4+ 2

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Availability

In Stock 7
Out of Stock 82

Manufacturer

Addictive Desert Designs 5
Agricover 1
AMP Research 14
B&W Trailer hitches 2
BAK Industries 3
BedRug 6
Bushwacker 1
Cognito 1
Edge Products 1
Husky Liners 1
Kleinn Automotive Air Horns 1
Lund 3
Putco 9
Ranch Hand 4
Rhino Rack 5
Rough Country 8
Rugged Liner 2
S&B Filters 3
Truxedo 4
WeatherTech 1
Wehrli Custom Fab 3
Westin 11

Show all Show less

Make

Chevrolet/GMC/GM 4
Ford/Chevrolet/GM/GMC/RAM/Dodge RAM/Universal 12
GM/Chevrolet 14
GM/Chevrolet/GMC 47
GM/GMC 11
GM/GMC/Chevrolet 1

Model

Sierra 11
Silverado 14
Silverado/Sierra 52

Year

2019-2022 1
2019-2025 2
2020-2021 3
2020-2023 7
2020-2025 61
2024-2025 3
Universal 12

Price

$2,998.98

Rating

0-1 70
4+ 2

Lund 47021201 3.5 inch Oval Bull Bar - Polished | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Lund

Lund 47021201 3.5 inch Oval Bull Bar - Polished | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: LND47021201

Price: $849.99

Lund 86521201 Revolution Bull Bar | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Lund

Lund 86521201 Revolution Bull Bar | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

SKU: LND86521201

Price: $949.99

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

AMP Research

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

SKU: AMP74841-00A

Price: $329.99

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

AMP Research

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

SKU: AMP74831-01A

Price: $329.99

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

BedRug

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

SKU: BEDBRC20LBMPK

Price: $479.95

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

BedRug

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

SKU: BEDBRC20LBK

Price: $479.95

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

BedRug

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

SKU: BEDBRC20SBMPK

Price: $479.95

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

BedRug

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

SKU: BEDBRC20SBK

Price: $479.95

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

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

SKU: TXO1274016

Price: $749.99

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

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

SKU: TXO1273716

Price: $699.99

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

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

SKU: TXO1273316

Price: $699.99

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

Truxedo

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

SKU: TXO1272816

Price: $749.99

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

AMP Research

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

SKU: AMP74608-01A

Price: $29.99

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

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

Price: $329

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

Rugged Liner

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

SKU: RUGWWC20HD

Price: $139

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

Wehrli Custom Fab

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

SKU: WCF100459-GB

Price: From $290.03

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

Wehrli Custom Fab

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

SKU: WCF100446

Price: $142.59

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

BedRug

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

SKU: BEDBRZSPRAYON

Price: $19.95

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

WeatherTech

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

SKU: WEA38211IM

Price: $317.95

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

AMP Research

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

SKU: AMP96255-01A

Price: $1,999.99

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

AMP Research

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

SKU: AMP74612-01A

Price: $59.99

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

Rough Country

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

SKU: RCSA-G12011-GPA

Price: $599.95

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

Rough Country

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

SKU: RCSA-G12011-GLT

Price: $599.95

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

Rough Country

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

SKU: RCSA-G12011-GJI

Price: $599.95

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

Bed Liners

Bed Racks

Bull Bars

Bumpers

Fender Flares

Grilles & Grille Guards

Mud Flaps

Roof Racks

Side Steps

Tonneau Covers

Loading products...

Lund 47021201 3.5 inch Oval Bull Bar - Polished | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

Lund 86521201 Revolution Bull Bar | 2020-2025 GM Silverado/Sierra 2500HD/3500HD

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

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

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

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ORDERS OVER $70

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