I'm installing SFC's and I have to remove the cat to install the passenger side frame connector.

Well I got all the bolts off and every thing and the damn thing still won't come off. I hammered the **** out of it and it still won't come off. It just seems like it's stuck to the y-pipe.

It's supposed to be a slip on cat isn't it?

What do I have to do to get it off?

My exhaust is all stock except for the muffler.

 

Just take out the whole y-pipe. It will be much easier. Althought it is a slip fit it is also crimped slightly. This crimp makes it impossible to slide off. Just dissconnect the y-pipe from the collectors and lower the whole unit.

 

Alright Shifty, thanks for the info.

 

now would be the perfect time to use a blue tipped wrench and add a high flow unit

 

How do you get the cat off if you have to change it? I ask because I think the cat is looking like the culperate for my emmissions problems.

 

Finally got mine off. I just used a torch and cut the thing off right at the y-pipe. Damn that thing sounds good now!

 

The way to take it off without butchering is to heat the inlet of the convertor with a torch until it is half glowing, and then you rotate the cat back and forth until it slides off (I put in my time at a couple of exhaust shops early in my career).

 

Hmm, could that be done a hand-held MAPP gas system (or whatever you would call it), or would you need an oxy-accetain (I cannot spell) setup.

 

I don't think that propane torches will do it, but an oxy-acetylene torch, or a turbo torch certainly would.

 

Yeah, you're definitely approaching this job the wrong way. I just installed alston sfc's in my car and had to get the cat out of the way. It's insane to try and remove the cat from the y-pipe when you can drop the whole y-pipe with the cat still attached to it in about 10 minutes. If you have trouble getting the nuts to loosen where the collector flanges are, you can do what I did. I sprayed some penetrating oil on the nuts, then started the car and ran it for a couple of minutes to get the exhaust nice and hot. Then you can usually loosen the nuts quite easily while they're still hot. Basically the same principle as using a "hot wrench". If you hammered the shzt out of the cat like you said, you better make sure the honeycomb stuff inside hasn't come loose, or you'll have a clogged exhaust. If it did come loose, just break it up with chisel or a long screwdriver and dump it out the back of the cat before you put the y-pipe back on.

 

MAPP will work, done it before. i used a chisel and a nice 5 lb hammer and pounded the b!tch out. i hate cats so much. id seriously think about changing it since its already off if its THAT rusted