I have a 2009 118d sport (E87) and am looking to put the m-sport package on the exterior of the car. I am going to get M-style to do this so it will be genuine parts and will be fitted by them. This is not a boy racer type modification, it's the kit you can buy from the showroom if you choose the m-type. It will involve changing the rear and front bumper, side skirts and possibly the wheels. I have two more years left on my warranty from BMW, will this become void if I carry out work? Any help appreciated.