My A6 has the OEM D2S bulbs set as low beams and I was looking to replace the highbeams(halogen H7's) with the D2Rs that are used in cars such as the lexus IS300. Since the D2S have projective properties, and the D2Rs have reflective properties I figured it wouldnt be that far of a stray but I was wondering if any sort of ballasts would have to be involved due to excess energy? Its another DIY project im working on and was curious to know if it could be done. Thx