Exhaust Manifold - OEM vs JBA Header - Toyota Tundra Forums : Tundra Solutions Forum
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post #1 of 16 (permalink) Old 04-05-2019, 04:52 PM Thread Starter
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Exhaust Manifold - OEM vs JBA Header

My 2002 Sequoia with 300k miles still runs GREAT and I plan to keep it for the forseeable future. I have a cracked exhaust manifold (engine runs fine, but exhaust rattles on start-up). I'm looking for advice on the best parts to replace my cracked manifold. Should I buy OEM parts from the dealer? JBA headers? After market (Dorman, etc)?

I see excellent reviews online for JBA headers, and the price is comparable to after-market Dorman stock manifolds. I haven't called the dealer yet for OEM pricing. I'm leaning toward JBA headers for the upgrade.

The truck is my DD. Improved power, gas mileage, & sound are "nice to haves" but not critical. Main goal for me is longevity and low-maintenance.

Any opinions or suggestions? I'm planning to do the work myself. I have done my own timing belt and other repairs, but am by no means a master mechanic. Thanks.
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post #2 of 16 (permalink) Old 04-05-2019, 08:57 PM
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Re: Exhaust Manifold - OEM vs JBA Header

Go with JBA thats what I did after crack manifold. Big improvement in hp/tq and throttle response. Just look how restrictive the oem headers are.
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post #3 of 16 (permalink) Old 04-06-2019, 08:23 AM
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Re: Exhaust Manifold - OEM vs JBA Header

Buy your JBA's with the best protective coating they offer.
Their ceramic coating after 15 years and about 130,000 miles
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post #4 of 16 (permalink) Old 04-08-2019, 06:23 AM
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Re: Exhaust Manifold - OEM vs JBA Header

I was pretty close to pulling the trigger on some new manifolds. They seemed to be pretty loud from the driver's seat. A couple months ago I fixed the broken silicone seal around the steering shaft that runs through the body. Turns out that was letting most of the noise in. After about 5 minutes of driving I made the decision that the original manifolds would be just fine. I can barely hear the clicking any more. Definitely replace them if you want, I just wanted to give you some input from someone with a high mileage sequoia (360k now) who is also looking to run it for the long term.

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post #5 of 16 (permalink) Old 04-11-2019, 10:40 PM
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Re: Exhaust Manifold - OEM vs JBA Header

I've a '01 Sequoia and replaced the original manifolds at 105K miles with the JBA headers do to a cracked manifold. I now have 378K miles on the truck, the headers have been flawless. I saw a slight boost in mileage, negligible increase in power b/c the truck is heavy and a few ponies aren't going to make a big impact. I'd go with JBAs again if I had to do it again.
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post #6 of 16 (permalink) Old 04-12-2019, 02:19 PM
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Re: Exhaust Manifold - OEM vs JBA Header

Quote:
Originally Posted by scwatcher View Post
I've a '01 Sequoia and replaced the original manifolds at 105K miles with the JBA headers do to a cracked manifold. I now have 378K miles on the truck, the headers have been flawless. I saw a slight boost in mileage, negligible increase in power b/c the truck is heavy and a few ponies aren't going to make a big impact. I'd go with JBAs again if I had to do it again.

No hassles at the smog check?

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post #7 of 16 (permalink) Old 04-13-2019, 09:46 PM
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Re: Exhaust Manifold - OEM vs JBA Header

No issues for emissions cert.
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post #8 of 16 (permalink) Old 04-14-2019, 05:31 PM
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Re: Exhaust Manifold - OEM vs JBA Header

Comes with smog sticker.
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post #9 of 16 (permalink) Old 04-15-2019, 06:48 AM
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Re: Exhaust Manifold - OEM vs JBA Header

Any guesses as why the stock headers crack? Is it just bad design/manufacturing?
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post #10 of 16 (permalink) Old 04-15-2019, 10:37 AM
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Re: Exhaust Manifold - OEM vs JBA Header

I'm guessing thin weak welds plus expand contract equal crack. My crack at the welds.
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post #11 of 16 (permalink) Old 04-15-2019, 05:00 PM
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Re: Exhaust Manifold - OEM vs JBA Header

Do they mate up with the factory flange to the existing exhaust system?
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post #12 of 16 (permalink) Old 04-15-2019, 07:17 PM
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Re: Exhaust Manifold - OEM vs JBA Header

Yes they do.
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post #13 of 16 (permalink) Old 04-16-2019, 04:38 PM
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Re: Exhaust Manifold - OEM vs JBA Header

What about engine bay heat management? The factory manifolds have provision for heat shields to allow heat to move away from the plastic and other components, and probably also retain heat for scavenging. Are the factory manifolds really restrictive. Because the heat i them probably helps in fast exhaust scavenging. I am planning on installing new manifolds too next month, because the originals are leaking. It is a first g n, so they have lasted about 15 years now. Just didn't want to sacrifice on what the toyota engineers did first place. The stock design does look restrictive, but simply looking is not the real test for gas flow where temperatures play a very important role.
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post #14 of 16 (permalink) Old 04-16-2019, 04:45 PM
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Re: Exhaust Manifold - OEM vs JBA Header

I was also reading that wraps on headers can mitigate high temperatures in the engine bay but can also have an adverse effect on the headers themselves by trapping more heat and causing the metal to get brittle. Any comments please?
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post #15 of 16 (permalink) Old 04-17-2019, 11:01 AM
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Re: Exhaust Manifold - OEM vs JBA Header

Quote:
Originally Posted by TUNDRA_ATTORNEY View Post
I was also reading that wraps on headers can mitigate high temperatures in the engine bay but can also have an adverse effect on the headers themselves by trapping more heat and causing the metal to get brittle. Any comments please?
Speaking generally, headers can cause heat issues on some vehicles. I've heard stories about starters burning up because of heat from new exhausts that ran lower than OEM. That being said, there are people on this thread (and all over the forums) who have been running the JBA headers for hundreds of thousands of miles. I don't recall ever seeing any issues come up regarding heat or references to wrapping the exhaust. Perhaps someone who has them will comment with their experience.

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