Exhaust› Headers, Manifolds and Components

Dorman

Exhaust Manifold

$147.30

SKU: 674-400

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Dorman 674-400 is a cast iron exhaust manifold designed as a direct replacement for specific vehicle models. This manifold is precision-engineered and durably manufactured to match the fit and function of the original equipment. It includes all necessary gaskets and downpipe hardware for a complete repair.
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The Dorman 674-400 is a cast iron exhaust manifold engineered to precisely match the fit and function of the original equipment on specified vehicles. This kit provides a complete repair solution, including all necessary gaskets and downpipe hardware. The exhaust manifold features a round port shape and comes with a heat shield for added protection. Its cast iron construction offers robust durability. This Dorman exhaust manifold is compatible with several Chevrolet, GMC, and Isuzu models, including the 1998-2000 Chevrolet S10, 1998-2000 GMC Sonoma, 1998-2000 Isuzu Hombre, and specific 2003 Chevrolet S10 and 2003 GMC Sonoma (TLEV) applications. It is an ideal replacement for worn or damaged original manifolds.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandDorman
Part Number674-400
CategoryExhaust
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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