hi i have a 98 f150 4.6 just wondering how will cutting off my cats effect my performance i know alot of people do it and have no problems and i have done it to several of my vehicles it didnt hurt them any but i have heard it kills these 4.6 motors also wondering bout the o2 sensors can i leave them out or would they mess stuff up not being in i sure it throws a cel

 

On the stock programming it wont run too great. If you custom tuned for it afterwards it would run a little better. Would also cancel out the CEL.

 

Great with a tune.