Yeah spoiler from mgzs will go straight on, and i think the accord typeR (or the dc2 integra typeR, cant remember which!) can be made to fit.
Sounds like the front speakers may have been changed as they are generally pretty lame, although the rears are shockingly bad!
Liking the underglow lights, not seen a car with those for a long time! Some might not like it but hey its your car and your style. Deffo different!