Ive been thinking about upgrading my 99 pcm for an 02 pcm. But im not quite sure of what all that I need. From what ive gathered i think that i need the 02 pcm, a pcm clip to run a wire from terminal 52 to the alt., and an 02 bcm that the dealer has to flash my vin into from the 02 pcm. If anyone could help me and tell me exactly what i need that would be great. Also i was wondering if an 05 pcm would work on my 99 and if it would be better than the 02 pcm.