The Saturn SL1 is a car owned by A.J’s science teacher, Mr. Miller.
History[]
In the episode 46 Long, the car was stolen, so Tony tried to help out by getting Big Pussy and Paulie to find the thieves and make them get it back, which they do. However by then it had been sent to a chop shop, so the thieves were made to steal a similiar model, pretty much identical to the stolen one so they could respray it and give it to the teacher, who accepted it despite being aware that it wasn't his original car, and the paint was still wet.