Well i thought about deleting my rear cats on my 05 F150 and replacing them with cutouts. That doesnt seem like such great idea now that i have read the responses. What about using 2 high flow cats in place of the 4 factory cats? What do i do with the sensors so i dont throw any codes? Any recommended brands or part number i could order and where?

 

2 high flow magnaflow cats will be good and your truck will burn cleaner than with all 4 factory ones according to troyer performance

you'd just have to have a shop make you a new mid pipe with the o2 bungs in and then it'll be perfect time to go to duals with a crossover pipe (H or X)

Darrin has all the part numbers and sizes (he's the resident exhaust guru even though he loves his maggies)