I have a full aftermarket system to include components in the front and coaxials in the rear, wow is the difference HUGE, you really can't even imagine until you have the chance to hop from a stock mach system to a nice aftermarket system. My system except for my Alpine Head Unit looks COMPLETELY stock, as i worried about this too. Especially having a vert, as the last thing I wanted to do was draw more attention to the car than it already gets. The stock mach amps are odd amperages and wattages and are designed to only work with the stock stuff, like a older post said, the components up front are really not true components. Sorta like a mix-breed component, mid-bass setup. I installed the Alpine's tweeters in the fatory pods, just remove the factory tweet and it'll fit right in there, (make sure to change any factory wiring as that crappy wiring is not intended for aftermarket amps that push a lot more wattage), sounds gorgeous but looks completely factory...perfect...