Ok well when I got my car all i had was the pioneer head unit and the 2 tweeters in the front. The car obviously had a system in it before and the guy i bought it from took it out when he sold me the car. Anyway there are no amps in the read or anything so i guess the mach460 has already been done away with or something. But I put in some xplod 240w 4 ways speakers in the rear and hooked them up there in the rear and well they work but it seems like they dont sound as good as I thought they would. My old V6 with the stock speakers and just a kenwood sounded a lot better then this does. Maybe I need to get the front speakers as well and I will get an improvement? This is frustrating... I want a good sounding system again... Thats the only thing i miss about my old 6 right now...