Dread man , truly dread
The car has not missed a beat . I know he has used them on the majority of uk tracks and spa francorchamps . They are slightly wider at the rear and do not foul the diffuser but to be honest I'm not sure about the wheel liners ( though he would have told me if there was an issue because of the amount of moaning I did about mine , haha). He uses a second set of the forged wheels without spacers btw .On what track(s) did he test them? Did he use different wheels and/or spacers ?no problems with rear diffusor and wheel liners?
Literally thousands of track miles later his 12 c needs for nothing apart from the obvious consumables like pads etc .