02 boxster basic sound system door speaker help

[Samp4856]

Hi guys,

Just a quick one I've just got my first boxster its a 2002 2.7 manual, i believe its the standard car so only has the two dash speakers, now I'm going to swap them out for some alpines and get a new head unit thats the east part, but my main question is, because my boxster doesn't have the door speakers is it an easy mod to fit some? Just thinking a couple of small speakers one in each door 5.25" or something just to get a little more bass as the dash speakers are being replaced with 4" units.

Cheers.

By the way its a 2002 uk car if that matters.