• aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
  • aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD - Stateside Performance - DPF Back - aFe - aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD
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AFE49-44126-B

aFe

aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD

aFe Large Bore-HD DPF-Back Exhaust System - 4 in 409SS w/ Black Tip | 2020-2026 GMC Sierra 2500HD

$808.00 USD
$808.00 USD
Sale Sold out
Shipping calculated at checkout.

The aFe Large Bore-HD 4in DPF-Back Exhaust System fits the 2020-2026 GMC Sierra 2500HD 6.6L L5P Duramax and delivers increased horsepower, torque, and throttle response.

Install Difficulty: DIY Possible
Bolts to factory hangers and mounting locations with hand tools; typically installs in 90-120 minutes with a vehicle lift. Some cutting may be required per the instruction sheet.

Product Overview

This DPF-back system uses 4in mandrel-bent 409 stainless steel tubing for maximum strength and durability on the L5P Duramax.

A mitered merge collector reduces turbulence and boosts exhaust velocity. The system finishes with dual 5in diameter black 304 stainless steel intercooled clamp-on tips featuring a riveted aFe POWER logo plate.

It bolts to factory hangers and mounting locations for a clean install. Some cutting may be required per the instruction sheet.

Features & Specifications

  • Fits: 2020-2026 GMC Sierra 2500HD 6.6L L5P Duramax
  • 4in mandrel-bent 409 stainless steel tubing
  • Dual 5in black 304 stainless intercooled clamp-on tips
  • Mitered merge collector for higher exhaust velocity
  • 100% MIG-welded construction
  • Bolts to factory hangers and mounting locations
  • aFe POWER logo plate riveted on tips
  • Some cutting may be required per instructions
  • All necessary hardware included

Fitment

This part fits the following vehicles:

Year Make Model Submodel
2020-2026 GMC Sierra 2500 HD AT4
2024-2026 GMC Sierra 2500 HD AT4X
2020-2021 GMC Sierra 2500 HD Base
2020-2026 GMC Sierra 2500 HD Denali
2024-2026 GMC Sierra 2500 HD Denali Ultimate
2022-2026 GMC Sierra 2500 HD Pro
2020-2026 GMC Sierra 2500 HD SLE
2020-2026 GMC Sierra 2500 HD SLT
⚠ Submodel Fitment: If your submodel is not listed in the fitment table above, we cannot confirm fitment. Please contact us before purchasing to verify.

Shipping & Returns

Tracking is typically provided within 3–5 business days; items shipping direct from the manufacturer may take 5–7. Some items are made to order or may be backordered. Questions about stock? Reach us through live chat or email.

Warranty

All warranties are through the manufacturer and are facilitated by Stateside Performance. Some manufacturers require the end user to contact them directly; in that case we will point you to the right contact. Email us with any warranty questions.

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  • Free shipping over $250

    Free shipping applies to items that are shipped via ground through UPS or FedEx and are over $250 going to the continental 48 states. This does not apply to Alaska or Hawaii, and does not apply to any item(s) that are shipped via freight or with any other option other than ground shipping.

    Shipping policy 

  • 30-day returns

    Returns must be requested within 30 days of delivery. Parts must be new, unused, uninstalled, and in original packaging, with an RMA. Some items are final sale.

    Return policy