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Old October 4th, 2007, 10:38 PM   #1
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Gutting the cats


I've run off road pipes on all of my mustangs and would like to do the same on my daily driver 93.

I can't just buy one so I am considering gutting the factory cats. I don't have to worry about emissions testing where I am. Has anyone done this on their car? After looking at the pipe, I don't really see how I can get anything in there to clear it out.
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Old October 4th, 2007, 11:41 PM   #2
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y dont you just buy a straight-thru exhaust? you'll gain some horsepower on top of not having the cats
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Old October 4th, 2007, 11:43 PM   #3
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yeah just cut the cats out and run straight pips
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Old October 4th, 2007, 11:56 PM   #4
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Take them off and replace them ith straight pipes
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Old October 5th, 2007, 08:15 AM   #5
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To run straight pipes I would have to take it to a shop to have them cut and weld. I don't have access to a welder and I don't think too many shops would be willing to cut the factory cats out, even without emissions testing.
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Old October 5th, 2007, 09:18 AM   #6
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anyone will do it for a price..
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Old October 5th, 2007, 12:16 PM   #7
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You can also look for other welders if thats the only part you need help with. I needed to pipes welded at one point and had my farrier (guy who shoes horses) do it. A lot of flute makers, construction workers, etc are really talented welders.
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Old October 5th, 2007, 01:16 PM   #8
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Hey Blivit where in florida are you located? If your around my area I should be able to help you. When we gutted the cats on my car I believe all we did was take a coat hanger bent it and pulled the mesh crap out that way. Alternative is buy an aftermarket header that negates the cat. Then that will require a little bit of welding.
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Old October 5th, 2007, 02:02 PM   #9
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I'm not too sure where Brandon is, but I am in central Florida; just outside of Orlando.

A coat hanger will do it? I thought it was fused to the pipe somehow on the inside. I've never actually gutted one, all of my other cars have had pre-made off road pipes.



Originally Posted by akatagyourit
Hey Blivit where in florida are you located? If your around my area I should be able to help you. When we gutted the cats on my car I believe all we did was take a coat hanger bent it and pulled the mesh crap out that way. Alternative is buy an aftermarket header that negates the cat. Then that will require a little bit of welding.
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Old October 5th, 2007, 04:31 PM   #10
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Brandon is west from Orlando. When I go home tonight i'll ask my dad what was needed to punch the cat out. He may remember. If I recall correctly yes it was just a coat hangar bent up. May have been something else. None the less i'll find out tonight. Oh and its about a 45 minute drive from brandon to orlando.
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Old October 5th, 2007, 07:12 PM   #11
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Ok just got done talking to my pops. Metal bar and a hammer is how mine was gutted. Line up the bar and mash it with a hammer till the internals of the cat break lose then push out basically. Little bit of work, but nothing major. Good luck to ya bud.
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Originally Posted by Hourofpain
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Old October 6th, 2007, 09:35 AM   #12
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Originally Posted by akatagyourit
Ok just got done talking to my pops. Metal bar and a hammer is how mine was gutted. Line up the bar and mash it with a hammer till the internals of the cat break lose then push out basically. Little bit of work, but nothing major. Good luck to ya bud.
With the bends in the pipe, I didn't think any sort of straight pipe would fit in there. Maybe I need to look at it again.

Thanks for checking
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Old October 6th, 2007, 10:36 AM   #13
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Originally Posted by Blivit
Originally Posted by akatagyourit
Ok just got done talking to my pops. Metal bar and a hammer is how mine was gutted. Line up the bar and mash it with a hammer till the internals of the cat break lose then push out basically. Little bit of work, but nothing major. Good luck to ya bud.
With the bends in the pipe, I didn't think any sort of straight pipe would fit in there. Maybe I need to look at it again.

Thanks for checking
The cat should have a 45 degree bend in it to attach the manifold to the underside exhaust, if you come from the the that attaches the back side of the exhaust and push through from there should be no problem.
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If i put flowmasters on my lawn mower will it sould like a gt?
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Old October 6th, 2007, 08:32 PM   #14
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so if there is a 45 degree angle smash from one end then
goto the other side and do the same you will eventually get that done as
well.

Still say it would be better just to get them removed. some muffler
shops might even be willing to do that for you.

Muffler shop that my shop deals with is willing to do a dual
exhaust setup and remove my cats for 200.00 and thats with 2.5in
pipe right from the header to the tips
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Old February 1st, 2008, 02:02 AM   #15
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will there be any backpressure issues hindering gas economy or performance?
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Old February 2nd, 2008, 12:00 AM   #16
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u dont have to ge tthe straight pipe welded in......u could just u-bolt it and tighten the crap out of the u-bolts there like 2.50 at autozone?

thas wat i would do if i couldnt weld it....
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Old February 2nd, 2008, 11:05 AM   #17
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Make sure you wear and mask and don't breath the dust. I have been told that asbestos in it. They are getting away from it but that is what the exhaust guys tell me. IMO, if you knock the guts out, once the exhaust hits the gutted cat, it doesn't have a smooth exit (unless you weld a pipe inside) and it may actually hurt the flow. Also, I know a guy that did it and it didn't sound so good. Either weld a pipe in or get a o/r and do a simple bolt on.
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Old February 8th, 2008, 04:48 PM   #18
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Originally Posted by eprench View Post
will there be any backpressure issues hindering gas economy or performance?

I ran straight pipes and I got a power increase (def. improved performance after I added a glasspack again) and my fuel economy increased a few mpg, but I had a clogged cat too. But it does help and it sounds pretty mean, haha.. People who don't know any better ask what it's packing. I dropped my boyfriend off at work one day and one of the guys asked him and he said a 351W just to mess with him and he believed it... but yeah. It helps. Delete. Oh, and upgrade spark plugs--I went from Bosch Plat to Plat 4s, it helps with the gas.
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Old February 13th, 2008, 09:56 AM   #19
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AHHHH!!!! save the material out of the cats!

if they are oem cats its worth big money!!!!!!


i just traded in three cats off of TCs and i got 145$$$$

lots of precious metals in the cats!!!!!!!!!! AHH!!!!!

enough yelling?
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