The Mach 460 system has pretty good sound. When I purchased my '00 GT it came with the Mach system from the factory but the previous owner went and jacked it up. I ended up replacing all 4 speakers with Kenwoods and the head unit with a Kenwood as well. It sounds great! But you have to do some minor rewiring to get rid of the POP that accumulates when replacing the head unit with an aftermarket.
2000 Mustang GT!!!
FRPP Intake manifold, Flowmaster 40's with larger pipes and tips (Nice deep tone).
"I want to own a shop where people can come and not get completely ripped off" - Ludacris (Fast Five)