Try a tune for it and cheat!
Crash the opponents, use them as brake, short cut, etc.
Is your WRX fully tuned? Buy every part you can and use the power limiter and add weight at a good position to balance the car (+50).
If your gonna cheat then use the pit exit lane to cut of a few more tenths then cut at the bottom of the hill and again at the cork screw but you still need to search on forum for a good set-up my best lap doing this was a 1.33.2, 1.34's will do it