2.5 or 3 inch - MustangForums.com

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Old 02-27-2005, 01:45 PM   #1  
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Default 2.5 or 3 inch

here is my motor...347 ci..pro top line heads..rpm intake 750 holley..all msd..10.5-1 comprrssion..cam is .520 with 292 dr..the headers are full lenght 1-5/8 with 3 inch collector..should i get 2.5 inch or 3inch exaust system
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Old 02-27-2005, 02:07 PM   #2  
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Default RE: 2.5 or 3 inch

3 inch. youre gonna be making lots of exhaust, plus it looks cooler
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Old 02-27-2005, 07:39 PM   #3  
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Default RE: 2.5 or 3 inch

for a small block like a 347 I would think a 2.5" exhaust would be plenty big enough after the collectors.
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Old 02-27-2005, 07:41 PM   #4  
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Default RE: 2.5 or 3 inch

Not too positive but you may lose power going with pipeing that big.
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