Can i put a cat for a f series under 8500 lbs gvw in a 8600 lbs gvw f250? will it mess up anything in the trucks system? or can i just run it? The cat's for under 8500lbs are sooo much cheaper

 

Yes the cat will work fine and it won't hurt the motor. The larger cat is spec'd for the HD trucks because they are designed to work harder and when doing so produce more polutants, so a larger cat is necessary to control those emissions. But if you're just driving it around the motor won't produce any more emissions than the same motor in an F150, so the slightly smaller cat will do.

 

I got the smaller cat and the y pipes for the F150 today, my question is what do i do with the two old emission air pipes that came off the top of the old cat? just leave them unhooked? will that mess the computer and system up?

 

anyone?????????

 

You could hook them up to the F150 Y pipe.

 

is there a spot on the f150 y pipe? i dont see any

 

The part should look something like this.. IMG_0763 on Flickr - Photo Sharing! and the fitting just behind the cat is for the air tube.

 

how do i hook up two pipes if there is only 1 fitting?

 

You'll have to fabricate something to Y them together, or better yet just remove all that air plumbing.

 

the fitting you are talking about, is it the one at the Y? or the one after the cat?

 

The one after the cat, the one at the Y is for the O2 sensor.