I have the same kit and it's very well made. The tires rubbing against the ducting at full lock has been an issue reported by many. Cantrell actually updated their recommended duct routing and did it on my car last week. It involves routing it under the lower control arm, changing the section locally to an oblong shape and securing it with zip-ties.
I would be really surprised if you don't rub with a non secured duct routing as you have it on the pics.
Current: 2016 F80 M3 SO | AB XT1 | ZCP | etc.
Previous: 2009 E90 M3