Since i moved to CO i now have to pass a smog test, so this weekend I'm going to have a cat welded back into the exhaust (i'm going to miss the free flow exhaust setup...) but i've lost the pipe that connects the Airpump to the CAT. Can i just use a hose or was the pipe important?

 

The split air pipe? Well, the stock one is metal... I wouldn't use rubber

Mine never came with one, or else I'd give ya mine.

 

With my Bonez superflow cat, I use a small length of heater hose to connect it from the cat to the metal pipe, and it holds fine. Although it's only a foot or so long, it is touching the exhaust at one of the hottest parts of the car and it's had no trouble. I don't see why running hose all the way up would be a big deal, you can find a way to route it away from the downpipe/precats/whatever. Only thing I would be worried about is where it goes past the manifold where the downpipe hooks up, it's going to have to get damn close to it.

Perhaps you could find some kind of 1/2 inch metal tube, mount it in there somehow, and then put hose on both ends?

 

Just to make sure, you mean where it connects to the air control valve correct? If you hook your cat dirrectly to the output of the smog pump for a long period of time you will melt your cat.

 

why not get a real split air pipe? a lot of people have em for sale... including me. ^_^

 

Way to plug your stuff for sale VietFC :-P

If you want to leave the cat in there full time and have the stock emissions setup to it, you should really actually buy a split air pipe. It's a special check valve to prevent exhaust from making it back up to the air control valve. I'd suggest doing it right and using the split air pipe or just straight piping it after you pass. :-)

 

Split air pipe is then, but i'll wait until i have the cat to get one.

 

PM'ed.... don't think mods will be too happy about me posting prices on this forum

 

Out of curriosity, why would this cause my cat to melt? I would think that dumping air that's colder then the exhaust would keep it from melting.

 

i think because hooking DIRECTLY to the cat would give it constant air supply while the ACV is supposed to regulate it for you and only give it air when it needs.

 

Colorado dosent have a state inspection or emissions process, so just pay someone to pass you. If you're willing to drive to the springs, I have a friend that would pass your car for $50.