Im lookin at redoin my exuast on my 99 f150 4x4 with the 5.4 was looking at what is left and noticed i have 4 cats and 4 o2 sensors i would like to eliminate the second set of cats and put high flows inbetween the the o2 sensors but im not sure how it will efect the sensors or the performance of the truck any help or expereince would help thanks

 

majority of the time it won't affect anything on the truck...



now if you use inferior cats, then yes you'll get a CEL, and if your SOP dyno isn't calibrated correctly, you won't feel any performance gains either

 

Im not realy looking for ant perfomance gain at the moment but better sound and one less thing to do down the road when i want more any suggestions on how to set it up after the cats like what to use to keep it balanced

 

might as well go with long tube headers then...

 

I thought about that how hard would be to make them fit it is a 4x4

 

they bolt right in



it's the mid pipe that needs the work, and since you're re-doing your exhaust anyway it's no big deal

 

how will o2 sensors go back in