gutting cat and muffler - Ford Powerstroke Diesel Forum
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post #1 of 26 Old 09-09-2009, 02:05 PM Thread Starter
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gutting cat and muffler

have a question in theory since I am suffering from "myfundsarelow" I already have the 3" dp could I gut the stock cat and muffler and put them right back in? My exhaust measures 3-1/2 inches out side diameter. does 4" really make a difference? Can you gut a muffler?
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post #2 of 26 Old 09-09-2009, 06:13 PM
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On my truck before I had the stack on it, my brother cut the cat open and took everything outta it and then pounded a pipe through the muffler and welded it on there.


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post #3 of 26 Old 09-09-2009, 06:54 PM
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I would just cut the muffler and cat out and just weld in a piece of pipe.

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post #4 of 26 Old 09-10-2009, 04:20 AM
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Check your local laws and such, but chances are, you can just cut the stupic cat out all together. And as for the muffler, you might or might not be able to cut it out. (many states don't care at all)

The list of guys here, who have "straight piped" trucks, is very, very long.

As for going to a 4" exhaust, I noticed a difference on my truck. (and I've only got a downpipe back setup. The 4" exhaust just has more room, so a little less resistance. Plus, it helps lower the EGT's. But you don't "need" it by any means.

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post #5 of 26 Old 09-19-2009, 11:01 AM
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Quote:
Originally Posted by deezelfromRofo View Post
have a question in theory since I am suffering from "myfundsarelow" I already have the 3" dp could I gut the stock cat and muffler and put them right back in? My exhaust measures 3-1/2 inches out side diameter. does 4" really make a difference? Can you gut a muffler?
There's people who make cat "test" or "delete" pipes, they go right in place of the cat.

Last edited by lunneborgc; 09-20-2009 at 10:37 AM. Reason: I wasn't paying attention...
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post #6 of 26 Old 09-19-2009, 01:02 PM
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the cat is simple to gut just pull it out and pound somethin into it and dump out the chunks as you go. just make sure you get it all out cause itll rattle around if you dont. the muffler on my 97 was strait thru to begin with.

97 f250 extended cab longbed 4x4
electric fuel, 5"pipe, 6pos chip
d60 swap 3" lift 315s
fresh e4od-blown
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post #7 of 26 Old 09-19-2009, 03:14 PM Thread Starter
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after the down pipe is the muffler next in series then the resonator at the back wheels? also doesn't the cat get deleted on the stock downpipe with the 3" down pipe?
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post #8 of 26 Old 09-19-2009, 03:18 PM
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not with all downpipes

97 f250 extended cab longbed 4x4
electric fuel, 5"pipe, 6pos chip
d60 swap 3" lift 315s
fresh e4od-blown
Mike
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post #9 of 26 Old 09-19-2009, 03:22 PM Thread Starter
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my buddy has a stock crimped down pipe and his looks like the cat is on there but my downpipe doesnt have the same. so i guess i just have to gut the muffler and resonator?
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post #10 of 26 Old 09-19-2009, 03:30 PM
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im not sure what your calling a resonator, a stock exhaust gos downpipe, flange, cat, slip fit connection, muffler and pipe out the back

97 f250 extended cab longbed 4x4
electric fuel, 5"pipe, 6pos chip
d60 swap 3" lift 315s
fresh e4od-blown
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