Lets see how the engine sounds in game stack up against the real life counterpart.
I’ll kick it off, my FM6 Modded 930 vs my Modded 930, ~500 HP in game and real life. Race intake, Exhaust, Cams, Turbo, Intercooler on both. The interior sound is pretty close minus the BOV and decel burbole. The exterior sound in Forza sounds more like the interior than real world. No wastegate opening sound or decel burble like you would typically hear on a turbo Porsche but pretty decent!
Interior
Forza 6
Real World
Exterior
Forza 6
Real World (Can hear a bit of my buddies V8 S4 in there)