The Stig was having more traction issues with the R8 in the turns then the ZR1…so that completely disregards your but the r8 has a slightly better drive-train and computer controls to help make sure all the power and grip can be used, not only on a track at full speed, but on a daily basis around town theory. This would also be called traction control which I believe (not 100% Positive) but theres 3 different settings…not to mention, for $600 more you can pully and tune a ZR1 and gain another 80-100rwhp…cant exactly do that to a V10 R8 without breaking the bank.