Yes you can. Tap into the signal lead from the head unit just before it enters the OEM amp in the trunk and use a dedicated sub amp (50 - 100 WPC). I have mine (Blaupunkt PA275 Class T) mounted right above the factory amp and hidden. If you don't have the CD changer, you can mount the sub amp where this would normally go. I think these subs are the best compromise barring an all-out IASCA install!