Would I notice a difference?

[Bludger]

But I mean specifically whats the difference? I'm not 100% but is it that coilovers will absorb more thus less 'bouncing' or ..? Also is there a resource with mods explained that would be fit for auto cars? Thanks

The most obvious difference is that you either replace your springs.......

OR

You get Coilovers......

ALL other differences/variables like I have already posted, will depend how much you put in......