It may be the fastest way , but i reached L40 B-spec by doing the 4 hour Nurburing ( i use to do the 24 hr Le Mans ) I could also play my A-Spec in the day and level there too this way i couldn't doing the Le mans. When you get to Level 40 you only get a trophy and then can buy the X2010, if you want the X2010 you can get them in the marketplace, so why rush and have no A-spec gaming just to get to L40 B-spec ?