Did you guys take into account that he won't be able to FIT 4 15"s in a car? Robin's wall has 2 15"s, and 2 18"s would pretty much take up all the available space he'd have. Gotta put the port somewhere.
Sheesh....I used to drive a 97 corolla and they aren't very different from a Camry as far as space goes and you could fit 4 15" subs in a corolla and yes still have room for the port....
And If by Robin you mean IamanMP3pimp well he drives a Dodge Neon if I am not mistaken....less room in a neon then a corolla or camry.
I did 2 15" suns in a wall and it wanged. I was doing mid 150's on burps and low 150s on music. So did what I wanted it to do. Was hella expensive subs though. Was running 2 of the Kove Armagedon U-2 ubers of 2 modded MTX 1501d's. Was insane inside. Was in a 2002 Mazda Protege 5. Pics are floating around here some where.