Stock down pipe with 4" cat-back system? - Ford Powerstroke Diesel Forum
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Old 10-07-2012, 08:30 PM
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Stock down pipe with 4" cat-back system?

I'm going to upgrade my exhaust to a 4" system with a magnaflow muffler. Will my stock down pipe flow well or should I upgrade to 3.5" or 4"? Will my EGT's be affected if I keep the stock down pipe?

Advantages? Disadvantages? I don't have much in the way of performance mods, other than an AFE intake.

Will be doing an SCT and gauge/monitoring package very shortly after the exhaust... Thx.
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Old 10-08-2012, 05:26 AM
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Im running the Diamond eye 5" TB no muffler at all. As far as egt's Im hoping to get my probe into the truck today so I cant tell ya about that. But I can say as far as installation, very easy no sweat,sound, awesome wish it was louder. Thats my .02
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Old 10-08-2012, 08:39 AM
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Quote:
Originally Posted by kinnisoj View Post
Im running the Diamond eye 5" TB no muffler at all. As far as egt's Im hoping to get my probe into the truck today so I cant tell ya about that. But I can say as far as installation, very easy no sweat,sound, awesome wish it was louder. Thats my .02
But what size is your down pipe?
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Old 10-08-2012, 09:29 AM
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I'm running a stock down pipe, I'm almost positive it's 3.5 stock. It then Y's out into 6" side pipes, I havnt had any trouble.
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Old 10-08-2012, 09:36 AM
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So other than size with a larger aftermarket down pipe, what are the advantages of an aftermarket down pipe--especially if one goes with a 3.5" down pipe?

And what helps lower EGT's--the down pipe or the over size exhaust with no cat?
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