A "slightly different" exhaust manifold question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mountie · 04-24-2018, 02:41 PM

1988 C2500 5.7...... I just replaced both exhaust flange doughnuts, due to a leak. Nuts..... there is still a leak ( it must be near the flange)....

If I replace a stock manifold, & maybe replace both, I want everything to bolt up & fit emissions the same. Is there such thing as a better version of a stock manifold? Maybe flows kind of like a header, or just "massaged" inside the manifold? No headers, unless they fit as stock, considering spark plugs, smog, etc... ( I read the issues of header fitment problems)

If not, I'll just do OEM.... But I thought I'd ask you guys first.

04-24-2018, 02:41 PM	#1
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	A "slightly different" exhaust manifold question? 1988 C2500 5.7...... I just replaced both exhaust flange doughnuts, due to a leak. Nuts..... there is still a leak ( it must be near the flange).... If I replace a stock manifold, & maybe replace both, I want everything to bolt up & fit emissions the same. Is there such thing as a better version of a stock manifold? Maybe flows kind of like a header, or just "massaged" inside the manifold? No headers, unless they fit as stock, considering spark plugs, smog, etc... ( I read the issues of header fitment problems) If not, I'll just do OEM.... But I thought I'd ask you guys first. __________________ '70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018)



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