if you find the setup isnt what you thought it would be try firecap501 on this site. he has arc audio amps that will satisfy the hungriest power junkie for tunes!
just remember thsat the radio powers the back speakers and the amp powers the front 4 speakers. the amp is a 45 watt amp pushing 10.125 watts per channel. slightly above a whisper in the amp world. blaupunkts push 100 watt per channel at a cost of arond 400$ yor looking at 45$ per watt!!
Not true. The amp powers the lower fairing speakers only. Stock head unit powers the fairing speakers and the rear speakers.