They warn you first to slow down if you make two back to back sub 11.50 passes. I got warned after two back to back 10.8x passes last year (2016). Didn't hear a peep from them this year running back to back 10.8x passes. If I get the car running solid 10's regardless of air next season then I will contemplate a roll bar. Hopefully the car's Christmas gifts will help with that in 2018. I love buying my car Christmas gifts.