despite elp_jc's disapproval, i think its a good idea. although i am too lazy to do this myself but i commend you for posting a DIY, i am sure this will give some ideas to other members who arent as lazy as me.
Current: 2013 F10 M5 & 2013 GLK350
997.1 GT3RS (gone)
2009 WRX STI (gone)
e92 M3 (gone)