I have the HRs and would NOT go lower. I'm scrapping all over the place when I don't slow down at bumps or take driveways at an angle ... keep in mind that there is an 'air diffuser' of some sort under the lip of the bumper that is a solid piece...not the flappy rubber types on other cars. I had not noticed this piece until I noticed the car srcapping at what I thought were clear heights.
2009 M3 : 6MT : Carbon : Silverstone : Fox Red Novilo : Aluminum Trim : Tech Package : iPod :
MODS: Performance Spoiler: Clear Reflectors : H&Rs : Escort 9500ix hardwired : Tint : Macht Schnell Filter : RPI Scoops : Rogue Pulley : Fabspeed resonated x-pipe with Remus Race : ESS Tune: TVinMotion