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exhaust pipe size

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Old 04-12-2006, 07:57 PM
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exhaust pipe size
I have a 92 F250HD with a 351W and E4OD. I was wondering what the size of the pipe is that comes off the manifolds.
 
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Old 04-13-2006, 05:34 AM
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I believe it is 2 1/4.
 
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Old 04-13-2006, 05:42 AM
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It's 2 1/2 coming off the manifolds, 3" between the cats, 2 1/2" at the back of the last cat, and then there is a step down pipe that steps it to 2 1/4.
 
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Old 04-13-2006, 07:04 AM
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Actually, it's 2 1/2 coming off of the driver's side manifold and 2 1/4 off the passenger side, into the converter. Why? The heck if know, one of Ford's things. Did the same with the 302 as well, but smaller pipe.
 
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Old 04-13-2006, 08:39 AM
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I have the HD setup which is one BIG cat. are both of those 2 1/4 coming off the manifolds?
 
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Old 04-13-2006, 09:38 AM
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On my HD, it's 2 1/2 into the cat from the driver's side, and 2 1/4 from the passenger's.
I'm just curious of why you're asking? New exhaust system?
 
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Old 04-13-2006, 02:03 PM
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I just want to try to improve my gas mileage a bit. I have a bunch of new or almost new 2 1/4 inch pipe, so I can probably do it for the price of some hardware and hangers.
 
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