Dorman 674-439 Exhaust Manifold

by Dorman

Product Features

• Includes heat-shield for protection of hoses, wiring, and other engine components
• Cast iron or stainless tubular construction protects against warping and/or cracking
• Leak-resistant for long-lasting performance
• A rigorous quality inspection has been undertaken to ensure that this part conforms to product standards
• A quality part backed by a Dorman limited lifetime warranty

Product Details

• Product Dimensions: 19.9 x 12.9 x 7.4 inches ; 15 pounds
• Shipping Weight: 18.3 pounds (View shipping rates and policies)
• Shipping: This item is also available for shipping to select countries outside the U.S.
• Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
• ASIN: B000C14HF6
• Item model number: 674-439
• Average Customer Review: 3.9 out of 5 stars  See all reviews (34 customer reviews)
• Amazon Best Sellers Rank: #54,696 in Automotive (See Top 100 in Automotive)
  • #38 in Automotive > Replacement Parts > Exhaust & Emissions > Manifold & Parts > Manifolds

Product Description

More like a complete kit than a single part, many of our Exhaust Manifolds include gaskets and hardware for a complete installation. Since this part is a direct replacement, the exact fit adds another layer of efficiency and convenience.

Customer Reviews

Most Helpful Customer Reviews

4 of 4 people found the following review helpful:

5.0 out of 5 stars Easy install on a 2000 Honda Civic VP, October 3, 2009

By 

C P (Blue Springs, MO) - See all my reviews

Amazon Verified Purchase

This review is from: Dorman 674-439 Exhaust Manifold (Misc.)

I spent a good month fretting over installing my Dorman Exhaust Manifold. I learned in 2008 after a repair job from Honda that I had a cracked manifold. They quoted about 900+ dollars to fix. I refused and went on my way. Well fast forward to summer 2009 and I noticed the "hissing" sound under the hood was becoming very annoying. Took off the heat shield to look and sure enough, a good 2 inch crack down the manifold. Determined to save money, I read that Dorman produces great replacement parts.

So I ordered one. Upon receiving the part, I noticed it had everything I needed and some extras that I wasn't certain I would use. So it sat, and sat, and sat....

Determined that after a good month, it was time to install it, especially after the first couple cool days. I could smell exhaust in the cabin.

This morning I went out, purchased some PB Blaster spray (similar to Liquid Wrench) and sprayed down the rusty nuts and bolts.

Everything came off with minimal effort. The most difficult part of the removal was the oxygen sensor plastic plug connectors. I spent 30 minutes trying to get those apart.

On reinstall, have some good ratchet extensions, wrenches, and a torque wrench (maybe even one of those fancy sockets that are slotted for oxygen sensor removal).

Took me a couple hours to reinstall. Start at the bottom and leave everything "loose" and work your way up to the manifold. Once everything is aligned and in place, start to tighten to manufacturer torque specs. Everything fit great.

Thumbs up to this product. I'm no mechanic, but I know enough about cars to know my limitations. This is definitely a part I was able to handle relatively well!

3 of 3 people found the following review helpful:

4.0 out of 5 stars Confusing Instructions But Good Fit, October 17, 2009

By 

Michael Chiarella - See all my reviews
(REAL NAME)   

Amazon Verified Purchase

This review is from: Dorman 674-439 Exhaust Manifold (Misc.)

This is my second Dorman manifold. I put the first one in a 1997 Honda Civic LX and the Second in a 1999 Honda Civic LX. The instructions are very general and are made for all of the different combinations of exhaust manifolds and catalytic converters. They say there are serrated flange nuts to attach the two parts but all I found in the box were normal grade 5 nuts. I purchased a few flange nuts and everything went together easily. There are also nuts and bolts included to attach a heat shield. On this catalytic converter the heat shield was pre-attached

Installation was pretty easy. The lower oxygen sensor was completely seized on both cars and had to be replaced. If you live in the rust belt expect to replace it. The Dorman is a little slimmer than the OEM version so it slides into place easily. Use a torque wrench so you don't crack the manifold. The car is much quieter now. The first installation took about 4 hours and two trips to the auto store and the second was only 2 hours with no trips. Overall, a good product and much less expensive than anything else around.

3 of 3 people found the following review helpful:

5.0 out of 5 stars Better price than any auto parts stores- includes two pieces, May 11, 2008

By 

David Frantti (Pittsburgh, PA) - See all my reviews
(REAL NAME)   

This review is from: Dorman 674-439 Exhaust Manifold (Misc.)

Cheaper than the auto stores and replaces the oem, it is different though, being two pieces vs one. Somewhat louder than the oem. Doesnt come with bolts to screw into the header but you can just reuse the old.