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livewirevoodoo's Avatar
 
Join Date: Jul 2004
Location: New Haven, CT
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i was robbed!....

....of power.

Guess i had a pretty bad exhaust leak up by the manifold. It started out small, pretty much since I had purchased the car. Originally sounded like crickets, or a chirping noise.

Over the winter, the cold weather and high exhaust temps, expansion & contraction made the leak worse. At low rpm the car sounded like certified crap and accel was anemic.

Had the manifold pulled (apparently the heat caused the bolts to sieze up which became a PITA to remove). Got the crack welded, what a difference. 60% quieter under the hood, and the exhaust purrs.

Ok, so thats the experience. My question tho... I've seen some aftermarket manifolds out there... MSDM or some other such company had one offered for around $250. Are there any inherent benefits with an aftermaket manifold over OEM as a replacement other than price? Its not a priority atm seeing as how a fix was possible, but i'm eager to learn something from the experience other than after a long day of work I miss the relaxing effects of exhaust fumes.
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Old 04-08-2005, 04:08 AM
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Some of the aftermarket ones will flow a little better. You would get more benefit be erplacing the entire exhaust, rather than just the headers.

AFJuvat
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Old 04-08-2005, 04:38 AM
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I should dig out the stock steel tube exhaust I took off of the donor car for my engine replacement. Looking down inside one of the maifolds where it Y's together you see all sorts of ragged ends sticking out. A real poor job. Real poor. After market would be worlds above it.
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Old 04-08-2005, 06:59 AM
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A stock manifold gets the job done, A Tuned Header can make a world of difference, Not only will it flow better its tuned to work with the exhaust pulses and help extract exhuast gases faster, Also in a Stock manifold all the ports are linked to each other which isnt so good for performance because one cyclinders exhaust gas can pressurize another cyclinders exhuast port making it harder to get the exhuast gas out. With a tuned header each port has its on equal lenght exhaust port and pipe, making things flow alot better. The bursch tuned Headers that I have on my 924S are a good design. The header is a long header it doesnt go to the collector until just past the firewall, Its a nice setup, But I think it could have been make a little better, I also had to modify A bracket to make it fit right and if you do by them get them coated or repainted.
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Old 04-09-2005, 11:27 AM
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