Convert e91 to sport suspension

I own a non-sport pre-lci e91 with 73k miles. I have been looking at many related posts, but I am not sure what the best options are? I am really not interested in lowering the car beyond the sport suspension level.

Has anyone done such a conversion?



These are the options I have seen:

Buy sport suspension bumpers, sport springs and struts

Buy aftermarket coilover kit



Any feedback is greatly appreciated!