I want to fix my exhaust leak and am looking at the OBX longtube kit off ebay. The question is other than emissions, does a lack of cats cause any malfunctions. I understand that I may get a cel for the aft o2 sensor but I can deal with that for now with mil eliminators if I have to.

 

go with 2 magnaflow high flow cats, they burn cleaner and sound much better than stock cats.

 

If you are putting on long tubes and not worried about emissions. I wouldn't hack it up just to put cats in.

 

I got a dumb question. If I were to remove my cats for the sake of a better free-flowing exhaust, what do I do with the upstream and downstream O2 sensors?

 

I used to work in an exhaust shop and to tell you the truth, you wont see any horspower gain by doing a full high flow cat back exhaust. By replacing the cats you will get more horsepower but it wont be anything you can feel. It's a lot of money to spend just for 2-3 h more horsepower. It will make the truck sound a lot more crisp if you have an aftermarket muffler though.

 

high flow cats gained me 12hp...

 

is that without the longtubes?

 

x2 with built54

 

So would it be the same to run no cats?