after market cat - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 02-15-2007, 10:30 AM Thread Starter
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after market cat

Do we have a source for a larger diameter cat?
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post #2 of 7 Old 02-15-2007, 01:37 PM
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Most people just delete the cat. If you have to go through and inspection yearly it only takes about 15 mins to put the cat back on.
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post #3 of 7 Old 02-15-2007, 02:02 PM
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cut off the cat i got 4" straight from the turbo back and it sounds great
I put the muffler on but didnt like the sound to beepbeepbeepbeep quiet
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post #4 of 7 Old 02-15-2007, 03:53 PM Thread Starter
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I'm looking for a 4" cat. Is the factory exhaust 4" on the F550?
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post #5 of 7 Old 02-15-2007, 05:25 PM
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It should be 3 1/2"

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post #6 of 7 Old 02-15-2007, 05:48 PM
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The cat inlet and outlet is 3.5. All you have to do is cut off enough of the in and out to make it 4 inches then weld it to the new 4 inch pipe. Problem solved.

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post #7 of 7 Old 02-16-2007, 04:55 AM Thread Starter
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Thanx

Doh! Cutting and welding 4" flanges should work. Thanx. I wonder what the I.D. on the factory cat is? Is is stainless?

It wouldn't work to weld on new flanges if the I.D. is < 4".
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