Actually it depends
So your big problem is that the 2003 has the optical (MOST) bus.
It will be hard to find an amp for that.
How many speakers do you have in your box 4 or 6?
If you have no rear speakers you could drive the two dash and two door speakers directly from the Pioneer unit (I have a 700 BT and drive 4 speakers with it and it works fine). However you will need to find the cables which lead to your speakers and connect them directly to your Pioneer.
I have the kit from treullionaire (I guess that's the eBay kit you're talking about) and
it's worth every penny.
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
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