correct me if I'm wrong (offset)
 

So if I find some wheels that I like and the offsets are 20 and 25 which are to aggressive for a sedan can I just get a 15mm spacer for the front and a 20mm spacer for the rears if the width of the wheel isn't an issue? thanks

no - that would give you a +5 offset

^^shane is right. spacers will give you an even more aggressive offset...lol

quite the opposite of what you want to achieve..think about it..they are call spacers, afterall. ;)

damn haha ok thanks for setting me straight