i have a 2006 Sierra RCSB with a 5.3 and was thinking about getting the pacesetter lt's, in the picture is shows where you can mount your two O2's, do they only have two on them or do you have to just do the toor and then get o2 deletes.. also installing the headers do you need a turn afterwards or does it run fine.. one more thing just using the o2s with no cats does it burn the sensors up fast or throw codes right away. thanks....

 

To answer your questions in order
1.)They only have 2 holes
2.) You'll need a tune to delete the CEL
3.) It will run, but a tune will make it run much better
4.)The rear o2s just monitor the function of the cats so it doesn't matter if they wear out faster, just take them out.

 

thanks for the fast turn