Going to get my cats taken out this coming weekend. Just curious as to if i should remove the pipes going into the cats from the smog pump taken out (If they will cause a problem without the cats being there) or to just have them welded into the bypass pipe, being that it wont be an issue effecting the way the engine runs. I know i can just pull the smog pump out and reroute the belt but i would like to know if just welding it back into the bypass pipe wouldn't cause an issue.

 

With a 89, I'm assuming its a factory n10 car? If so and it has the factory cats, remove (and save) the cats so they could be replaced easily down the road.

 

Okay, but could I keep the smog pump and the pipes running to the existing cats and weld them into the bypass pipe?

 

The ones with the rubber hoses being the ones i am asking if they could be welded into the bypass pipe

 

If that is your exhaust, those aren't the original cats but yes, you can plumb the a.i.r. tubes into the exhaust but it may backfire once in awhile.

 

If the cats are never going back on I'd get all the air parts off. It's just there to add oxygen to the cats. Much harder to put back on than take off though.

 

Not my exhaust, just a picture i found searching through the forums. Figured it would help see what i was talking about.

 

Think im gonna go with removing all of it, just so its out of the way.