Drivers side of the block.
Mine was built 2/25/09 ECM that is and the bit(h is protected...truck was built on 3/4/09.
Bought is brand new to boot!!
If it works for you, I'm gonna be pissed!! Lol
well someone told him that it wouldnt work but it didhe is wrong bud the edge is the only tuner that will work even if your ecm is locked. the edge does not reprogram the ecm so the bootloader is no issue for it. it is an indepth fooler box that works fine even with the locked ecm no worries at all with the edge