I had my front speakers replaced with German Maistro's (sounds much better)
Do you know if the standard D40 front 6x9 speakers are better than the rear door 6"set? If so can the salvaged fronts go in the back
Don't know, hey. Considering that they are a factory unit, personally i wouldn't waste my time. Hit up ebay. heaps of Alpine, Pioneer or even Fusion stuff that is better than stock that is going cheap.