I swapped out my head unit in my O5. still running the stock speakers up front. sounds okay. the front speakers in the door are wired witht the tweeters in the dash. should run fine for now. savin $ for a the front and rear speakers. you should do fine. however, you might want to "play" with the bass output as the stocks don't handle well. I 'm runnin stockers with "negative" bass and my amp and sub for the lows. sounds good. good luck hope this helps.