Credits:
Base model (in general) - Assetto Corsa
Suspension - Project Cars
Tail lights (LM bumper) Forza Horizion
Convert, set up, rear brake's air fusion system, GTR wide Spoiler and LM spoiler - Maxim Gorbanev
 Features:
Livery Support
HQ Exterior  
HQ Interior, Doorsills, Partly Engine
Hands on Steeringwheel
Working Dials on Dash
Interior hasn't drity level
Correct position seat for driver (1st, 3rd person view)
Correct Window Tints
Incompatibility with tuning rimpacks (rear wheels look smaller than it should be, this is problem of GTAV's models used front left wheel as reference, but McLaren F1 have different Tire's radious between front and rear wheels)
12 Liveries
#60 LARK Alternative;  
#59 Tokyo Ueno Clinic Later ; 
#59 Kokusai Kaihatsu UK Racing; 
#51 Mach One Racing;  
#60 BMW Japan LARK; 
Metalic alloy silver paint; 
XP1 LM Liver; 
Carbon body paint; 
Livery Gulf #33  (Assetto Corsa  version);  
Livery Fina #39  (Assetto Corsa  version); 
Livery Fina #42  (Assetto Corsa version); 
Livery Gulf #24  (Assetto Corsa  version); 
5 spoilers
GTR Wide Carbon (unpaintable);
Paintable LM spoiler (look at 2nd pic);
GTR spoiler (Assetto Corsa);
GTR Wide paintable (look at 3rd pic);
LM carbon spoiler (stock one with increased downforce)
3 exhausts
Copper exhausts;
Stainless Steel's Exhausts;
Stock exhausts with flames glow;
2 rear bumpers
GTR short tail competition;
LM (classic) short tail;
Radio antenna
5 Sunstrips
sun stripe McLaren GTR (#59 Kokusai Kaihatsu UK Racing);
BMW Japan sun stripe (#60 LARK);
Alternative BMW Japan sun strip;
Mach One Racing sun stripe;
Tokyo Ueno Clinic sun strip;