Gutting the Cat, - Ford Powerstroke Diesel Forum
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Old 11-15-2010, 04:15 PM
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Gutting the Cat,

Ok, so the truck has 296k miles, and some stage 1 injectors. I don't have the extra for a down pipe right now, but it seems gutting the cat would be free. Is it worth the effort? Any tips from those that have done it?

thanks in advance

Bill
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Old 11-15-2010, 10:01 PM
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well from the engine to the tip is all exhaust pipe on mine completely straight all the way out no cat no muff. if you have a few buck to spend on a couple feet of pipe to feel the gap where the muffler and cat go id do it even if you keep it stock circumference. probably looking 40-50 bucks max at a muffler shop. i dont know how much if any performance i got of it but it sounds sweet as h e double hockey sticks
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Old 11-16-2010, 03:24 PM
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just go to napa and get u some 3inch pipe and some clamps
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Old 11-16-2010, 03:30 PM
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yes it helps... the cat doesnt really want to come off tho iwill wan you the dp bolts are practically welded on and the clamp towards the rear has formed the overlapping pipes toone another...i think the factory exauhst is 3 1/4 if my memory serves me right....

if you can get it off punch it out. if you cant cut it behind the bolts weld and clamp..
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Old 11-17-2010, 09:45 AM
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Big difference when I did it and a Tymar intake at the same time..3mpg's! Thats with the stock exhaust system...I was very surprised at the difference in being able to pull hills faster afterwards.
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Old 11-18-2010, 05:38 PM
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Hope to be able to get this done tomorrow, a call to an ol buddy that runs a muffler shop, 30$ and he'll cut at the cat and replace past the muffler,
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Old 11-18-2010, 06:05 PM
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So straight pipe from down pipe to tip or leavin in muffleri suggest cutting the mufler the sound will make you pitch a tent
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Old 11-19-2010, 02:59 PM
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DONE, Cut it just past the flange for the converter, 3" straight dumped just before the axle, Sounds Great! I hope I can find some mileage in it also!
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