More info needed ... type of car? Type of protection you are looking for (smash and grap protection is a lot easier/cheaper than a more secure solution.
Anyway a couple of suggestions would be the FAS1 and the GunVault NanoVault come time mind ... these are VERY different and will cost close to 10x differently as a result ...
I have a couple of those Nanos ... they satisfy the TSA and they are VERY low profile, so while the "Club" will fit under most seats, I'd bet that the Nano would even fit under the seat of a Ferrari ... just know that neither of these will keep someone with tools away from your handgun. I would recommend that you at least take a peek at the FAS1 just so that you know what your choices are.
