Ebay/OBX style header install w/plenty of PICS (LONG, but detailed)
#402
#409
so after i throw these on, (03 Z71 sierra) my cai, do i tune out the rear o2's? do i need a tune after they are installed? i have the diablo sport but im not sure if it has an efficient tune for the "catted" lt's. sorry for not reading all 41 pages before asking.


