removing cats

[firefighter_2319]

this weekend i will be removing my cats from my 5.7 vortec. do i need to put the spark plug non foulers on the doewnstream (back) 2 02 sensors and have no CSE light or can i just cut out the bungs from the cats and install them on the new exhaust pipe? and does anyone know the size of the non fouler i need to do this? thanks

 

[2000CCSB]

I'm planning on pulling my cats once I get my 411 then just doing away with my rear o2's. but I will Also have them tuned out also. then puttin and X-pipe in place of the cats. 2 feet of pipe after the x dumped into 4" tail pipe 5" inch tip.

 

[GMstrong]

dual 4" tailpipes?hopefully your not towing/hauling with this truck cause it will be gutless.Just buy some new o2 bungs drill a hole in the pipe for the o2 then weld the o2 bung and screw in the o2 sensor,done.