im currently installing my zzp header dp combo with a catless mid pipe when i realized the catless mid pipe has no o2 sensor hole. is there supposed to be one? what do i do with the post cat o2 sensor since my new catless dp does not have a hole for it?

 

when u order a catless dp you don't use the rear o2 a tuner will have to shut ur rear o2 off

 

okay thanks man.