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Different Exhaust Manifolds? WTH!!

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Different Exhaust Manifolds? WTH!!

Postby dsaint69 [OP] » May 30 2021, 1:00am

Ok, so who out here is the real cracker jack?? I've got another issue now with my stock exhaust manifolds. The original 02 that had the issue had messed up manifolds that were Jerry rigged by the previous owner so I can't use them again. And the new motor, which I thought was the same.....uh....not so much, has totally different flanges at the end of the manifolds. So guess what. The new ones don't fit at all. The old ones had a type of you look like a "Y". where the new pipe manifold look like a pyramid. Both are 3 hole. So after doing a bit of research I found out that if you own an 02 Sierra 4wd reg cab with an 8.1, chances are the new to me old 2002 Silverado 3500 2wd dually motor isn't exactly going to be the same, not so much at all! After I called the dealer they informed me the Y pipe part# 15070540 is discontinued. And after googling it there are none out there. Not that I can find anyway. I guess before I go to a junkyard and find new old manifolds that work, has anyone ever run into this problem and are there flanges out there I can just weld onto my old Y pipe? Part #, or link to those flanges for both sides would be really valuable information for me because I'm going crazy trying to figure this out. TIA!
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Re: Different Exhaust Manifolds? WTH!!

Postby NARDA1 » May 30 2021, 1:16pm

Could you use aftermarket shorty headers?
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Re: Different Exhaust Manifolds? WTH!!

Postby Walkers » May 30 2021, 3:41pm

A couple of pictures would get you way farther down the road.
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Re: Different Exhaust Manifolds? WTH!!

Postby dsaint69 [OP] » May 30 2021, 5:16pm

Tried to submit photos last nite but had no luck.
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Re: Different Exhaust Manifolds? WTH!!

Postby GBSierraSLE » May 30 2021, 6:22pm

You have to upload and incert photos where you want them to appear in your post. Click on Upload Attachment just below the text box of your post.
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