Hi everyone, im looking to upgrade/change my speakers.  I just want to change the door speakers first as i have heard the rears dont provide too much sound overall
 
	 
 
	I currently have a DMX7017DABS headunit installed using this http://www.caraudiodirect.co.uk/incar-tec-29-674-nissan-350z-bose-amplified-steering-control-interface-adaptor
 
	 
 
	What i want to know is.   
 
	1... If i purchase two 6.5" speakers, will it be plug and play or do i need to change out the Amp located in the boot?  Is this the only additional job or will i need to run new wires to the head unit?