FWIW, I have a $6500 Dynaudio/McIntosh system installed in my car. The system has actually made it on TV and in print.
But here's my point: It sounds like god when you're sitting still.
Once underway, it still sounds great, but the road noise causes so many problems with phase cancellation that you lose a LOT of fidelity. The entire car is dynamat'ed and the sub is isolated.
My advice, having gone thru this now, is I would throw some decent Pioneer or low-end Focal components in there, a mid-quality deck, and be done w/ it. Just my 2c.
