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post #1 of 6 (permalink) Old 04-08-2008, 12:54 AM Thread Starter
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stock exhaust manifold diameter

what is the stock exhaust manifold outlet diameter for a '95 4.6?

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post #2 of 6 (permalink) Old 04-08-2008, 07:33 AM
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reason for question? just curious... because it doesn't really matter if you want to enlarge it unless you open up the inside as well... i can get a measurement for you in a little bit if no one responds before me


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post #3 of 6 (permalink) Old 04-08-2008, 12:58 PM Thread Starter
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I just don't want to do a 2.5" custom exhaust if the outlet diameter is only 2.25". I'd have all that space for flow for nothing.

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post #4 of 6 (permalink) Old 04-08-2008, 02:25 PM
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I want to know this too actually. If someone could get the runner dia as well that would be awesome. Thanks!

1995 T-bird 4.6l - Eibach lowering springs, Cobra R hood, One 12" sub woofer, Alpine type-R front speakers. 16.249 @85.11mph 1/4 mile
2001 Pontiac Trans Am WS6 - Cam, headers, HPtuned by me.
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post #5 of 6 (permalink) Old 04-08-2008, 10:00 PM
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i have a set of ported braincoated manifolds and a set of stockers

if i get the ok from tbirdbrain, i'll post the numbers. there isn't much different in the outlet or the inlets...but the meat in the middle... i have no way of measuring runner diameter inside the manifold...but i know how much was taken out

for the record.. RobertP has brain coated super ported manifolds and 2.25" compression bent exhaust...and runs 11s


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post #6 of 6 (permalink) Old 04-08-2008, 10:47 PM Thread Starter
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Oh, I'm not doubting the potential of the stock manifolds. In fact, I talked a guy out of spending $$$ on the jbas in favor of the stock; citing the guys running 11s with ported stockers. I'm trying to setup a group purchase for true dual exhaust for the local club, I just need to know what size would be the best to go with.

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