LORELAI: Oh yeah. A Volvo sedan, are you kidding?
CHRISTOPHER: This is a great car.
LORELAI: For driving to bingo.
CHRISTOPHER: I’ve got Alpine head units, two subs, and two twelves. In exchange, no passenger-side airbag.
Volvo is a Swedish brand of luxury cars founded in 1927; the name is Latin for “I roll”. It was founded upon the concept of safety, and their cars have long been marketed as safe and reliable; many of the Volvo’s safety innovations have now become standard or even compulsory. Lorelai sees it as an old person’s car, because of its staid and rather boring image.
I think Christopher’s car is a 2001 Volvo S80, an executive sedan. He describes the car’s sound system as Alpine brand head units, with two sub woofers, and two twelve-inch sub woofers (maybe he means two amplifiers and two twelve-inch sub woofers?), which means he had to give up passenger-side airbags, a major feature of the S80. So he’s bought a safe car, and made it less safe (for the person who’s not him), so he can enjoy music.
As Lorelai notes, Christopher has given up his cool motorcycle for a sensible car, but the old (selfish) Christopher still lives. Take warning!
(There is an immediate shot of the Massachusetts license plate, to remind us Christopher has moved to Boston. It begins with 169, which seems like a naughty joke, although it’s not a vanity plate, so not deliberate on Christopher’s part).