Hi again while still waiting for the cash to turn up so I can get the car I have been looking at new head units to put a cd in the car do I need to bypass the amp in the boot when I change to a more powerful radio 45w x4 as I have read the standard unit only puts out 5w to the amp which is boosted to only 20w in the amp. I still want to run all the speakers maby upgrade later. I am getting older and do not need to go for ear busting sound levels.