removing cat for a day or two...
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Mountain Pass
Joined: Sep 2003
Posts: 143
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From: So Cal
removing cat for a day or two...
I removed my cat just to see what it would sound like and it was crazy loud to say the least. I'd like to leave it out for desert trips but I am concerned about the motor not liking it or causing damage for some reason. Will keeping the cat removed for a couple days at a time a couple times a year cause any damage to anything on my truck?
Also just as a test I put a piece of pipe in place of the cat and I got ~3mpg better over a tank by calculating the mileage and not the lie-o-meter. The cat is back in but I really like the way it sounded with it off... just wondering if it will cause any issues if I do it ocassionally.
...other than really **** off my neighbors when I leave for work at 5AM.
Also just as a test I put a piece of pipe in place of the cat and I got ~3mpg better over a tank by calculating the mileage and not the lie-o-meter. The cat is back in but I really like the way it sounded with it off... just wondering if it will cause any issues if I do it ocassionally.
...other than really **** off my neighbors when I leave for work at 5AM.
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Mountain Pass
Joined: Sep 2003
Posts: 143
Likes: 0
From: So Cal
Cool... it sure does suck however that folks in other states do not have cats yet here in Cali we have to use them.
When I briefly removed mine, it was a huge difference in seat of the pants performance. I have never noticed a mod doing this much except for re-gearing or maybe when I did a MAFS and TB upgrade on my old 1999 Ranger.
When I briefly removed mine, it was a huge difference in seat of the pants performance. I have never noticed a mod doing this much except for re-gearing or maybe when I did a MAFS and TB upgrade on my old 1999 Ranger.
Senior User
Joined: Sep 2005
Posts: 357
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cars without cats
On a car, it will most definitely effect performance. Car's have smaller dameter pipes because large ones don't cause enough back pressure and the exhaust just kind of chills out in the pipes. On a truck, it isn't that big of an issue, and factory truck systems tend to be restrictive and not let the exhaust breath as freely as it should.
On a truck=cool-better performance and LOUD (but a muffler will make it bearable to your neighbors)
On a car=crap-worse performance and crappy sounding
On a truck=cool-better performance and LOUD (but a muffler will make it bearable to your neighbors)
On a car=crap-worse performance and crappy sounding
Posting Guru
Joined: Jan 2004
Posts: 1,185
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From: Tennessee
You really dont have to worry about the cat unless your state has emission testing. On a diesel the convertor doesn,t to hardly anything anyway so its not that big of deal. In fact a local test on a 6.0 stock w/ exhaust passed emissions with the convertor removed 
Posting Guru
Joined: Jan 2004
Posts: 1,185
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From: Tennessee
no deisels dont have O2 sensors........
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Junior User
Joined: Jul 2005
Posts: 53
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From: Jerkintown, PA
could you take off the cat and hollow it out then reinstall it so it looks like its still there? does a hollowed out cat get the same sound and performance as putting a straight pipe in its place?
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decadent and depraved
Joined: Jan 2005
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From: Right Behind You
What I did to mine was take the cat off and punch all of the stuff out of it, and then put it back on. It sounds great, and I have expierenced no problems for the last 47,000 miles. I say go for it!!!
Tim
Tim
Postmaster
Joined: Sep 2002
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From: None of your business
Run a pipe through it. That big chamber slows down exhaust gasses quite a bit. If it were me, I'd just cut the cat out, install a straight pipe, and stuff the good cat away somewhere for when it's time to sell the thing.
Mike
Mike
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Joined: Jan 2006
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I think the powerstrokes sound awesome without any muffler or cat on them at all, you can really hear the turbo spool down and they are not that loud even when your on the throttle. My last powerstroke was straight pipe from the turbo to the tip
Senior User
Joined: May 2005
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From: Atlanta GA
Originally Posted by NJTy180
what size is the pipe where the cat is? 3.5" OD?
does anyone just sell a test pipe?
does anyone just sell a test pipe?