I need ya'll's help
 

I was wondering if i need the extensions for the front or rear o2s?? Or do i need them? Also, does anybody have the hptuner so i could just turn them off???

You will need two 24" front extensions for the front o2 sensors, the back ones can be deleted with hp tuner or ls1 edit, you can also pick up some o2 sims for the rear sensors if you cant find anyone to delete the code.