Mach tweeters. Nothing else is plug and play and even a good set that is rigged to work with the Mach wiring won't sound any better. Mach system that you want to do a stereo for=full gut and re-wire of the whole car. Why I prefer to get cars without the Mach system if I'm going to put a stereo in it.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.