Question 1

What parts do I need for a exhaust upgrade on my 2021 GMC Sierra 3500 HD?

Accepted Answer

A complete exhaust upgrade on the 2021 GMC Sierra 3500 HD typically requires cat-back exhaust, headers, mufflers. This page groups parts commonly associated with that year, make, and model; confirm your trim on product pages for exact fit.

Question 2

How long does a exhaust upgrade take on a 2021 GMC Sierra 3500 HD?

Accepted Answer

A exhaust upgrade typically takes 2-5 hours and is rated as moderate difficulty. Actual time may vary depending on your experience and the specific parts being replaced.

Question 3

Can I do a exhaust upgrade myself?

Accepted Answer

A exhaust upgrade is a moderate DIY project. If you have some mechanical experience and the right tools, you can handle it. Otherwise, consider having a professional do the work.

Question 4

Are these parts guaranteed to fit my 2021 GMC Sierra 3500 HD?

Accepted Answer

These parts are listed for the 2021 GMC Sierra 3500 HD using manufacturer fitment data. Some products fit every trim, while others require trim confirmation. Use your trim in My Garage or the product page fitment checker to confirm exact fit.

Question 5

What brands make exhaust upgrade parts for the 2021 GMC Sierra 3500 HD?

Accepted Answer

We carry exhaust upgrade parts from trusted brands including aFe, Banks Power, Borla, Fel-Pro, and Victor Reinz. Filter by brand to find your preferred manufacturer.

Question 6

How much does a exhaust upgrade cost for a 2021 GMC Sierra 3500 HD?

Accepted Answer

The cost of a exhaust upgrade for the 2021 GMC Sierra 3500 HD depends on the parts and brands you choose. Browse the parts on this page to see current pricing. Doing the work yourself saves significantly on labor costs.

2021 GMC Sierra 3500 HD Exhaust Upgrade Parts

Cat-Back Exhaust

aFe 20-23 GM 2500/3500HD V8 6.6L L8T Apollo GT Series 4in 409 SS Cat-Back Exhaust System

aFe Apollo GT Series 3in 409SS Cat-Back Exhaust w/ Black Tip 2020 GM 2500/3500HD V8 6.6L L8T

aFe Apollo GT Series 3in 409SS Cat-Back Exhaust w/ Polished Tip 2020 GM 2500/3500HD V8 6.6L L8T

aFe Apollo GT Series 4in 409SS Cat-Back 20-21 GM 2500/3500HD V8-6.6L L8T - Black Tip

Banks Power 20-21 Chevy/GMC 2500/3500 6.6L Monster Exhaust System - Black Tip

Banks Power 20-21 Chevy/GMC 2500/3500 6.6L Monster Sport Exhaust System

Borla 20-22 Chevrolet/GMC Silverado/Sierra 6.6L T-304 SS Cat-Back S-Type Exhaust - Brushed

Borla 20-22 Chevrolet/GMC Silverado/Sierra 6.6L T-304 SS Cat-Back S-Type Exhaust - Brushed

Headers

aFe Twisted 1-3/4in 304SS Shorty Header 20-23 GM 2500/3500HD 6.6L V8

Fel-Pro Chevrolet Silverado 1500 Exhaust Manifold Gasket Set

MAHLE Original 14-15 GM 5.3L Vin C Exhaust Manifold Set

Wehrli 17-24 Chevrolet Duramax Billet Exhaust Manifold & Stainless Up Pipe Kit w/ Gaskets & Hardware

Wehrli 17-24 L5P Duramax Billet Exhaust Manifold Kit w/ Gaskets and ARP Hardware

Mufflers

aFe Large Bore-HD 4in 409SS DPF-Back Exhaust System w/Black Tip 20 GM Diesel Trucks V8-6.6L (td) L5P

aFe Large Bore-HD 4in 409SS DPF-Back Exhaust System w/Polished Tips 20 GM Diesel Trucks V8-6.6L

aFe Large Bore-HD 5 IN 409 SS DPF-Back Exhaust System w/Black Tip 20-21 GM Truck V8-6.6L

aFe Large Bore-HD 5 IN 409 SS DPF-Back Exhaust System w/Polished Tip 20-23 GM Truck V8-6.6L

Borla 20-22 Chevrolet/GMC Silverado/Sierra 6.6L T-304 Stainless Steel Extension Pipe - Brushed

Corsa Chevrolet Duramax Diesel 6.2L Muffler

Fel-Pro 03-13 Chevrolet Silverado 1500/00-09 Tahoe Exhaust Manifold Hardware Kit

Fel-Pro 09-13 Chevrolet Silverado 1500/08-13 Tahoe Exhaust Pipe Flange Gasket

Exhaust Upgrade for Other GMC Sierra 3500 HD Years

Other Jobs for Your 2021 GMC Sierra 3500 HD

Frequently Asked Questions