# Wehrli 01-04 Duramax LB7 Billet Exhaust Manifold & SS Up Pipes w/ Gaskets and ARP Hardware

WCFab's 2001-2004 LB7 Duramax Billet Exhaust Manifolds replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components. These manifolds are exhaust port gasket matched and internally divided for optimal flow with OEM or ported cylinder heads. Outlet locations allow full compatibility with OEM style up pipes and are paired with WCFab's 2" Stainless High-Flow Up Pipes for optimized performance. Includes new gaskets, ARP 12PT fasteners, and assembly lube for easy install. Finished in Black Ceramic Coat rated for 2000 deg F.Manifold replaces the following GM Part Numbers: 12637647, 12624683, 97224587

-   1/8 NPT ports (and optional plugs) included in driver and passenger side manifold for installation of EGT or drive pressure sensors
-   Fully TIG Welded, CNC machined billet steel exhaust manifolds
-   Finished in Black Ceramic Coat rated for 2000 deg F
-   Includes new gaskets for manifolds & up pipes
-   Includes ARP 12PT Fasteners and Washers
-   Made in USA

This Part Fits:

Year

Make

Model

Submodel

2001-2004

Chevrolet

Silverado 2500 HD

Base

2001-2004

Chevrolet

Silverado 2500 HD

LS

2001-2004

Chevrolet

Silverado 2500 HD

LT

2004

Chevrolet

Silverado 2500 HD

WT

2001-2004

Chevrolet

Silverado 3500

Base

2001-2004

Chevrolet

Silverado 3500

LS

2001-2004

Chevrolet

Silverado 3500

LT

2004

Chevrolet

Silverado 3500

WT

2002-2004

GMC

Sierra 2500 HD

Base

2001-2002

GMC

Sierra 2500 HD

SL

2001-2004

GMC

Sierra 2500 HD

SLE

2001-2004

GMC

Sierra 2500 HD

SLT

2003-2004

GMC

Sierra 2500 HD

WT

2002-2004

GMC

Sierra 3500

Base

2001-2002

GMC

Sierra 3500

SL

2001-2004

GMC

Sierra 3500

SLE

2001-2004

GMC

Sierra 3500

SLT

2004

GMC

Sierra 3500

WT

## Details

- **Price:** 2685.22 CAD
- **Vendor:** Wehrli
- **Type:** Headers & Manifolds

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2685.22 CAD | In stock |

## Images

- Photo - Primary
- Photo - Mounted
- Photo - Mounted
- Photo - Mounted
- Photo - Mounted
- User 6
- User 3
- User 2
- User 7
- User 4

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/wehrli-01-04-duramax-lb7-billet-exhaust-manifold-ss-up-pipes-w-gaskets-and-arp-hardware)
> Updated: 2026-07-07