Ya once you practice some you can get a stock 787b down to well under 6 minutes. With no hp mods, soft tires, all driving aids off and abs-0, I can consistently do the GT all stars race in under 6 minutes, and thats from a standing start with 7 cars to pass. Just keep practicing and memorizing the track. I found that doing it in a DTM car helped me all around on that track better than practicing with a super fast car, because your going fast enough that its fun and you have to drive properly, but slow enough that you can really learn the track and figure out how to flow on it. I do the German Touring championship as my dtm car time trial. my best time on that race in a stock clk dtm on racing softs with all aids off was 6:33:7xx