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you will need to get an adaptor harness from a GOOD specialist audio supplier i would imagine (or make one up your self)...also bear in mind that when you heard the units they were probably in a shop (which is a VERY different environment to a car), in a stand DESIGNED to maximise the bass in all likelyhood and NOT using the speakers you have in your car..therfore the likely hood of it sounding the same in the car is minimal!
Why not go visit your volvo dealer and sit in some s40-s and listen to the various sound system options...find one you like and buy it a fit to your car...
this will have a number of advantages...(1) everything will be stock (2) it should fit in easily (3) no need to mess with the wirring (4) it will look right (5) you get to listen to it in the right place BEFORE you buy it....
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