The McLaren can compete..........with ford gt, vette, viper, Aston Martin, i.e., any PRODUCTION CAR IN THE GAME.
It does however lag behind against the JGTC and GTM cars (you will be totally smoked against the big boy LM racers).
I used the McLaren in the 200 mile "El Capitan" and my competition were a Viper, Vette, Mustang, Styker and Lotus Elise........................I won, but only lapped the Elise five times in just under a two hour race (the McLaren is not a very stable corner handler but it could have been due to the 'sport tires required').
I am going to use the McLaren against production cars ONLY (to race it against the LM touring, JGTC, GTM and Racers is futile)!!