https://sites.google.com/site/gt5tune/home
Try that link Pure. Not sure if you knew about that site, but it has tunes for almost every car in GT5, including the car your looking for. Adrenaline, a GTPlanet member, was kind enough to make that site for everyone.
I think every person who requests an X1 tune, should have to provide photo proof, they even have the driving skills to benefit from any tuning adjustment in the first place. Like, 3 consecutive laps at a real track, all within a reasonable margin of error.