Originally Posted by VP Electricity
I really think you are offering him solutions to problems he doesn't have. Based on what he's said, the first would be a waste, and the second would be far from enough.
the MS-8 was not a solution to a problem, its the first step in building a good system due to how easy it is to mess around with crossover points, sound stage, EQ etc
XD600/6 is a great amp for the car, but you'd need another amp for step 3
my guess is he'd need a trunk mounted sub (step 3) to fulfill his "a bad ass system" requirement
i don't think you can get "damn loud" with 4" speakers, no matter what brand you use.