Cat or No Cat?
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Joined: Aug 2011
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Cat or No Cat?
I have a 07 F250 6.0L with the Banks Monster exhaust with the cat. Everything else with the engine is stock. I have been wanting to take the cat off and leave the Banks muffler but didn't know if it could damage the engine. Any Ideas?
FTE Fan
Joined: Jun 2007
Posts: 344
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From: Winder, Georgia
I live in an county that doesn't require emissions testing. So I removed the cat. Made the turbo whistle louder. As far as how the removal affected the EBP or EGT, I don't have gauges to monitor that. I'm sure another user will chime in and have some before and after data.
Posting Guru
Joined: Jan 2009
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i gutted mine,but left the pipe in.dont have an egt sensor but alot of guys say that with it gone it lowers temps.i did noticed the turbo spools faster though.the major thing i do notice is the cat hides alot of smoke.with it on it would only smoke at startup,with it off if im hunting,and driving slow alot,with low combustion temps it tends to smoke a little.
Logistics Pro
Joined: Mar 2007
Posts: 4,604
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From: Claremore, OK
With my truck, I dropped 200F there about when the cat fell off one day. The state of AR doesn't do emissions testing...so unless the Feds show up some day to look at my truck; I'm ok for now. You won't cause any damage to the engine, and I seriously doubt the engine cares what the exhaust is doing once it exits the turbo.
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Joined: Jun 2004
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From: Gig Harbor, WA
This is a little off-topic, hope nobody is put off. I live in a smog state and cannot find a local shop to make me a custom CAT delete pipe. My initial plan was to gut the CAT, for off road use, of course. But, upon reflection have decided a CAT delete pipe is probably a smarter was to go. My problem is that I have a 4" CAT back system that is welded into the down stream side of the CAT. So, I need stock 3.5" ball connection to the stock down pipe (No, I am not interested in a 4" down pipe.) matted to a 4" pipe? Anyone have any suggestions where I might get this fabricated? Thanks and happy new year! 
Fulltime INFIDEL!
Joined: Jul 2010
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From: Down South
It won't hurt anything.This is a little off-topic, hope nobody is put off. I live in a smog state and cannot find a local shop to make me a custom CAT delete pipe. My initial plan was to gut the CAT, for off road use, of course. But, upon reflection have decided a CAT delete pipe is probably a smarter was to go. My problem is that I have a 4" CAT back system that is welded into the down stream side of the CAT. So, I need stock 3.5" ball connection to the stock down pipe (No, I am not interested in a 4" down pipe.) matted to a 4" pipe? Anyone have any suggestions where I might get this fabricated? Thanks and happy new year!
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New User
Joined: Aug 2011
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Thanks for the replies. I already have the delete pipe just have to find time to take the cat off.
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Senior User
Joined: Apr 2011
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From: Eastern Oregon
i gutted mine,but left the pipe in.dont have an egt sensor but alot of guys say that with it gone it lowers temps.i did noticed the turbo spools faster though.the major thing i do notice is the cat hides alot of smoke.with it on it would only smoke at startup,with it off if im hunting,and driving slow alot,with low combustion temps it tends to smoke a little.
Senior User
Joined: Apr 2011
Posts: 249
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From: Eastern Oregon
oh and by the way i say, take the CAT off, I had the luxury of previously having a MRBP 4in exhuast setup without the CAT, and it sounded "nice", but decided to cut out the Muff, and go all straight. AWESOME!!! Is all that can discribe my feelings when the guy drove it out of the shop, and rev'd it up for me.
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