Generally the Sunfire and Cavalier are the same mechanically. There are some cosmetic differences but that is about it. Once in a while Pontiac will tune a car differently than Chevrolet but for the most part what will work on a Cav will work on a Sunfire and visa versa. If there is a programmer for a 2.4 Cav. then it should work for the 2.4 Sunfire. I wouldn't think that would be true for a GA unless you were dealing with an Alero but who would want to tune a Pontiac like an Olds anyway!