Hello, Ive used a number of non-stock bulbs for my cars. Some time back I posed the question of the best up-grade bulbs for my M2....A fellow forum member made the outstanding suggestion of some Osrams ...I bought some and they performed excellent for some 55,000 miles and still going...I decided to buy another pair and when I called to order I was told that there was an enhanced version out so of course I bought a pair....I strongly suggest that if you are looking for an outstanding pair of headlight bulbs that you call/google Candlepower.com....The people, product & service are stellar.....