I had my manifold welded for $20 bucks about 50k miles ago. Still going strong


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Radiator -> get another OEM one and be done. BUT pictures of said possible leak. (NOTE) I've owned my truck since new in 2004 and I'm still on my original radiator and 116,378 miles strong

Exhaust Manifold -> poor design on GM's part. The drain for the AC drips on to the hot cast iron exhaust manifold. Hot + cold = cracks. I had a local shop weld mine up; its a special process to weld cast iron, but it only cost me $150. I removed the exhaust manifold and dropped it off at the shop; it only took them a couple hours

 

Cool, I'll order an OEM radiator.. wish the H3 two-core was a drop in part.. still haven't been able to find the leak with my own eyes yet...

 

http://www.355nation.net/forum/engi...gines-performance-tech-questions/77481-so-you-looking-header-your-i4-i5-v8.html

 

This not only lists headers but a few manifold/header type pieces with cats as well. Covers all the bases and will definitely be cheaper than 1500 by far.

 

My truck is an '09 and I just had a set of KPE headers installed on it. The mechanic showed me that my truck's exhaust manifold was cracked. Unless you live in CA, I'd recommend something like OBX headers(they are a bit cheaper). Improve Gas milage and power while replacing an inferior component.

 

KPE or OBX header...add some zing to your ride!

 

I think cracked manifold are common in this engine family. My 02 Envoy has a cracked manifold and that's the six-cylinder engine which the four- and five- cylinder Colorado/Canyon engines were based off. I found a non-OEM manifold on Amazon for $125, and was told online that it's about two hours shop labor. I'm just concerned about bolts breaking off in the head and driving up the cost of the repair. I'm not certain but I think the primary difference in price is that the Colorado/Canyon manifold has a catalytic converter combined with it while the Envoy doesn't, but don't quote me on that

 

What is the outcome on emissions and mixture control by using a cat delete header?

 

A cracked manifold is all the excuse I would need to go to headers. But then we don't have emissions tests or any kind of inspections here in Florida.....

 

IIRC, I got a notice that I was covered for a cracked exhaust manifold until I hit something like 125,000 (exact number escapes me) for my 2009.

Too many minor recalls on the truck and car to keep track of them all.

 

Submitted my issue to GM yesterday. We shall see how it goes.

I like the header idea and read the thread that said you could do a cat delete header without screwing up emissions or the computer control systems. Is this in fact true? I don't want to be ending up with CEL lights and crap.

 

What year your truck is will change what you need to do in order to not have any CELs set but it is very simple to do for any year. Your secondary cat will clean up the rest.

 

I was just looking in the engine bay and couldn't see a second 02 sensor (maybe it is out of view underneath.)

 

it isn't too far after the first so you should have been able to see it. I believe the dual o2 sensor versions have one before the manifold cat and one after but the 07's i think were in between and still had only 1.

 

Well, GM gave me the middle finger. The dealership however stepped up in place and offered a reduced rate on parts and labor to the sum of a little over 400 bucks. I'm gonna take them up on the reduced labor but I think I'm gonna do an OBX header. Might weld and hold onto the old manifold too.

Wonder how much GM is going to loose the next time someone buys an F-150 instead of a Silverado because of my advice..

 

Are you actually upset that GM didn't warranty a 10 year old part? Or is that just how it sounds with my internet interpretation?

 

I was upset with mine, was extremely lucky the warranty was expiring in 9 DAYS!!! and was still covered. I have read of some do-it-yourselfers like me getting the OEM manifold and it being warped from the manufacturer, but still installing the part and pulling in the mating surfaces using the bolts. I would hope not too many people would use that as an option but the may be other circumstances. It seems headers are the way to go if you have to pay yourself.

 

Why pay the dealer to install the OBX header????

Its one of the easiest DIY mods out there...... unless you have more money then time :shrug:

 

Should have specified....If you have to pay for a new manifold, headers are the way to go. Buy it and install yourself. A trusted mechanic is way better than a dealer, My opinion anyway, if you cant or don't want to do it yourself.

 

I trust the mechanic at the dealer, I have been friends with the parts manager for a long time. I'm not so torqued that GM wouldn't do anything as I am that they designed such a crappy part. And yes, more money than time, and generally tools. My tool budgets over the years have been geared toward gunsmithing... not that a header requires much.. I don't even have a torq wrench though.. not to mention the finesse and nuance of experience.. I have seen some newbs do some pretty stupid shit to guns and I'd hate to do the same to the truck.

 

Welp, GM gave me 2K off my next GM purchase.