I HAVE A USED BULLYDOG POWER PUP PROGRAMMER .I USED IT FOR 3 MONTHS AND SOLD MY TRUCK. IT IS BASICALLY NEW. IT WILL WORK ON ANY GM VEHICLE FROM 98 TO 06 .IT COST ME $600.00 .IM SELLING IT FOR $350 . THIS IS FOR A GAS VEHICLE IT GIVES YOU BETTER GAS MILLAGE PLUS HORSEPOWER . I will accept a good offer. !!!