This is one of the hardest challenges in the game, at least that I've come across so far. B2R Garally makes it a point to challenge anyone he talks to into trying it. It's sorta known as the impossible AC challenge. They give you a piece of crap BMW that cannot corner to save it's life. The thing just has no grip - it's on street tires to make matters worse. Anyways - the challenge for Gold is to get under 1:52.000
It was a pain in my ass, but I finally did it.
Added (2014-11-21, 8:13 PM)
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ok, maybe this is the hardest challenge in the game. Neither PectoRis, B2R Garally, or I could get a Bronze on this thing this morning. I finally did, but it's a tough challenge.
Added (2014-11-22, 4:20 AM)
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Finally broke into the 2:19's