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Old 09-03-2006, 03:35 PM
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exhaust manifold

I have a 350cid chevy with 2 inch exhaust manifolds.
Would I notice any appreciable differance in power if the next time I needed new exaust pipes I changed over to a 2 1/2" manifold.
Right now the pipes are 2 1/2" and reduce down to 2" to match the manifold.
Would it be worth the extra $$ in added power.

Thanks, Mark

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Old 09-03-2006, 04:34 PM
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If your looking for the power i would suggest spend the extra money and go with headers. Otherwise you will get some extra horse's with the 2.5 but only maybe 5 or 10 at the most, but headers probably at least 10 to 20, also if you go bigger ethier way it wont matter if you cant get it out faster, so you might want to upgrade your heads and or a more aggressive cam.
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Old 09-03-2006, 05:01 PM
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to get 5 or 10 at the most going 2 1/2 is well worth the extra cost for no more than it is. headers are best they dissipate alot of heat
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Old 09-03-2006, 05:23 PM
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runn is right also i would suggest if you do go headers BUY HEADER WRAP, TRUST ME!!!! i bought the headers and my hole engine compartment was hot i installed the exhaust wrap and SERIOUSLY the temp. went down by 80% SERIOUSLY, buy that if you get them and put the wrap on BEFORE you install the headers. SERIOUSLY get the wrap and use it. Dont mean to yell, just trying to advise.
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Old 09-03-2006, 05:52 PM
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Quote:
Originally Posted by WHIPPININMY68
runn is right also i would suggest if you do go headers BUY HEADER WRAP, TRUST ME!!!! i bought the headers and my hole engine compartment was hot i installed the exhaust wrap and SERIOUSLY the temp. went down by 80% SERIOUSLY, buy that if you get them and put the wrap on BEFORE you install the headers. SERIOUSLY get the wrap and use it. Dont mean to yell, just trying to advise.
headder wrap will cause the tubes to rust quickly and the headders will not last long. buy a set of headders with jet hot coating, will do the same thing as headder wrap except protect the headders from rusting and look nice doing so.
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Old 09-03-2006, 05:56 PM
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other than that you can get stove and grill paint they wont burn off, of course it wont insulate.
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Old 09-03-2006, 06:05 PM
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How does it make them rust?
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Old 09-03-2006, 06:21 PM
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How does it make them rust?
condensation, road spray from wet roads makes it's way under the wrap and holds it there. they do rust trust me.
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Old 09-03-2006, 09:54 PM
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After like a day, month, year, or what.
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Old 09-04-2006, 04:57 AM
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Originally Posted by WHIPPININMY68
After like a day, month, year, or what.
quicker than it would happen without the wrap, headders would probably start to show rust within a week or so depending on road conditions, headders might last a couple years wraped. this is assuming painted headders, if you wrap jet hot coated headders than they will last forever, even wraped but for a street vehicle it makes no sense to wrap them because the coating cuts heat by itself.
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