Knockin out the Cat? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-05-2011, 02:16 PM Thread Starter
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Knockin out the Cat?

One of my buddies had a modded out 6.0. He suggested as a simple change that I cut the cat out, knock the ceramic out, and then weld it back on. Hes got all the equipment and he did it on his straight pipe. He said it bumped up his mpg by about 1 and spools the turbo about 400rpm faster. Anyone else have any experience?
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post #2 of 11 Old 03-05-2011, 02:20 PM
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Just take it out and put in a delete pipe and save the cat. For about 65 bucks its gone, but if you ever have to put the cat on for some reason you can just bolt it back in. The cats are real expensive and you never know what might have to be done for inspection and what not down the road. That's what I did and it does spool a little faster and it sounds awesome too.

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post #3 of 11 Old 03-05-2011, 02:23 PM
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You need about 5 feet of 3 1/2 inch pipe(may want to measure yours), 2 band style exhaust clamps and a hanger or 2 to hold the pipe tight. This will replace the cat and muffler and let it come out through the stock tailpipe. Don't forget the downpipe either. I haven't done that yet on mine, but I got rid of muffler and cat.

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post #4 of 11 Old 03-10-2011, 08:43 AM
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I hollowed out my cat and welded back together i now get 20 psi of boost under full throttle where as before i could only get a max of 11 psi of boost under full throttle. make sure you get rid of the factory air filter housing for the DIY 6637 kit so you can hear the sweet sound of a spooling turbo.
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post #5 of 11 Old 03-10-2011, 08:44 AM
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this is my next mod the cat delete and the intake did it on a buddys sounds great

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4 inch lift o 36"s
3"DP to 7" Mitre Cut Stacks no cat/muffler
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post #6 of 11 Old 03-10-2011, 09:19 AM
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Getting the cat out is the hard part, gutting it is the easy part. If you live in a state where they emissions test, I'd gut the factory cat and bolt it back in so it appears stock.

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post #7 of 11 Old 03-10-2011, 09:25 AM
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Quote:
Originally Posted by superduty4x4 View Post
Getting the cat out is the hard part, gutting it is the easy part. If you live in a state where they emissions test, I'd gut the factory cat and bolt it back in so it appears stock.
thats what we did on his and goin to do on mine

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3"DP to 7" Mitre Cut Stacks no cat/muffler
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post #8 of 11 Old 03-21-2011, 12:32 PM
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Quote:
Originally Posted by mjones3586 View Post
thats what we did on his and goin to do on mine
+1, gutting it isn't real easy but getting it out is a mother. Since I gutted mine I heard an easier way to gut the cat.

Use a torch and get the guts of the cat real hot. Then hose it down with a garden hose and it should fracture and make the removal of the catalyst much easier.

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post #9 of 11 Old 03-22-2011, 11:03 AM
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I did the Cat delete last year,can't tell a whole lot of difference other than slight noise level increase.

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post #10 of 11 Old 03-22-2011, 06:12 PM Thread Starter
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thanks for all the suggestions guys!
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