there are 3 upgrade options each of "Mclaren" upgrade choices
the first one is for longtail version
the second is for GTR conversion
the third is for LM conversion
i have smart idea, if you want superfast Mclaren F1 GTR. buy Cerbera Speed 12, it's very stable at high speed when turning
copy and paste these files, it can be found in Vehicules folder :
Mclaren_F1_GTR.bnk
Mclaren_F1_GTR_I.bnk
then, rename them into :
Speed_12.bnk
Speed_12_I.bnk
don't worry, it'll named as Speed_12 (2).bnk after you renamed them
don't forget to put the original Cerbera Speed 12 files to your backup folder. so, you can recover the original model later
(don't forget to delete "(2)" name on files to avoid game crashing)
after you done, play the game and you'll see the Cerbera has replaced into F1 GTR with lowered suspension. why the interior camera has weird POV? because it's Cerbera's camera interior (i still don't know where to find to replace camera POV interior)
why the sound is different from F1 GTR? for that, do a replace file method. you can find it in sounds>vehicules
wanna change the HUD? replace the file, it can be founded in FrontEnd>HiRes>Gauges
hope this help you :3