I need some help on changing my exhaust. I have a 2002 F150 supercab 4x4 with a V8. I want to go to a dual but what some recomendations on how to go about it. Should i stay with 1 cat and go with a cat back or go to 2 cats. Then should I go with magna flow,flowmaster, or what.

 

You have 4 cats already and they are all in the y pipe. If you want a dual setup just have your muffler shop cut off portion of the y pipe that merges into one pipe and with two pipes from there back. Then get some magnaflows and your set.

 

Chop both headpipes off behind the cats and you're set.