regarding differences in performance: here you have a link for live timing of the ELMS practice session in imola, where you can easily compare gt3 times (GTC class) and gte times (LM GTE class)
http://www.europeanlemansseries.com/en/s54_courses/s54p01_classement.php
will also be nice to see what we can do, when we get our hands at the 458 in assetto corsa's imola
http://www.europeanlemansseries.com/en/s54_courses/s54p01_classement.php
will also be nice to see what we can do, when we get our hands at the 458 in assetto corsa's imola