ok I have the stock infinity deck 05 spyder I kicked down for the factory I pod conector (that was cheep}now I ame wanting to install a aftermarket amp .not even considering a new deck .what do I have to do I read alot of posts about swaping decks but no info on swaping amps .and if I can swap amps do I need new component speeks up FR .I was looking in to 5 ch amps for space and symplisity .thear will olny be room for a few bags in the trunk with a sub box alredy.do any amps come with the din plug in I have been reading about?

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you do not need new speakers you just need to disconnect your stock amp and the speaker wires to the amp then connect them to the new amp. you will be getting a harness extension to do this, or you can get a female to male RCA extension to do it. then run a separate power wire. then just jump the remote wires and speaker wires to your new amp and you should be good. remember to place the new amp in a area where it receives airflow to keep the temp down on it.