This article came in 10 days ago and although the Z/28 lapped Sachsenring 2.5 seconds faster than the BMW M4 ,the German still consisder the M4 the winner in this head to head comparaison.
http://www.germancarforum.com/commun...ro-z-28.51612/
Notice: the cost of the Z/28 is $98,000 Euro ($118,355.usd) compare to the $89Keuro for the M4.
Read the comments from the bloggers, always the same excuses: It's because of the Trofeo R tires!
Check out the lap times list at Sachsenring :
http://fastestlaps.com/tracks/sachsenring.html
I'm a bit desapointed in the lap time... I hope that MT laguna Seca time will tel another story against the Porsche 911 Turbo S (991)...