if you have longtubes and run highflow cats will the rear o2 codes still come on? or is it only when you dont run cats?

 

likely, my 6.2 did. i have h/flow cats and lt's
last 2 trucks did too
just turn off error report in the tune to turn the light off.

 

ok thanks man i figured they would but ive had 3 or 4 ppl say they wouldnt if you have cats.. how much should a custom y for longtubes cost just guessing?

 

which headers are you getting, can you buy the y-pipe that goes with it.

I would say about $200 to make one and install it.

 

i ordered some pacesetters but have to have a custom y built bc the 6.2 cat back wont bolt up with a 5.3 or 6.0 y pipe! i kno pace is 1 3/4 but thats fine bc i just have bolt ons not major mods yet anyway haha.. if i do eventually which im thinking of i may buy some 1 7/8 but idk it will still be much better than stock with those..