Originally Posted by int2str
Yes, I'm running it (N54 135i).
It's a strong tune that doesn't compromise drivability at all. Power delivery is absolutely smooth and strong. It's not "boosty" and very linear in it's power delivery.
I've done two autocrosses since switching tunes and I've won my class both times and finished very high overall. Both times beating every 1M in the field, btw
But the thing I absolutely like the best about the tune is how responsive GIAC is to any question or support and how well they stand behind their product!
Definitely highly recommended!
good to know. the only reason why i have not put software on the car yet is i do not want to run into limp mode when on the track. any issues with that?