Muskamatt... you don't know me very well... sorry... actually still race corvettes... and think they are great cars... if the GTR had race tires... I'd cry foul too...
Personally... I've been saying for 15 years... I wish all of these comparisons would use a spec tire... to help 'level' the field. As some manufactures would choose just 'horrendous' street tires... and others would choose great ones. Most of the manufactures now have stepped up to all using a quality tire... and in my opinion the best 'all round' performance tire is the regular Michelin PS2.
Onourleft... completely agree about shaving tires... done it for years and won multiple national championships back in the BFG R1 days... when we needed to... now almost all 'race tires' come molded to 4 5 or 6/32nd... and that's made life a bit easier!
The PS-Cup's are not the same on the Vettes as the others... go to tirerack... and you can research the three 'models' of cup tires.
Musk... by the way... the ZR1 beat the GTR and many others... in 2010 with the 'standard' PS2's also... ZR1 is the real deal... and I have plenty of posts 'around here' stating it is the SuperCar that put all manufactures on notice.
2010 ZR1 3ZR Wht/Blk 10.7 @ 132
2011 C63 AMG P31 Car Blk/Blk 11.8 @ 117
2010 Nissan GT-R 10.8 @ 129 (Sold)
2008 Lexus IS-F (Sold) 12.5 @ 113 / 2008 Shelby GT500 (Sold) 11.3 @ 126
2008 e90 M3 6MT 12.8 @ 111 (Sold) / 2006 e60 M5 12.4 @ 114 (Sold)