The Silvia S14 Zenki in Forza Motorsport has a very artificial feeling sound. RPMs above 5000 sound like they’re just pitched up from that 5k sound, and there is a noise of a very unpleasant frequency that can be heard throughout the entire RPM range, I would describe it as “nasal”. It reminds me of a sound that was reused on multiple cars in Forza Horizon 4 (Audi TT S, Honda Civic FK2).
While I think the biggest issue with this car is its model, I hope that one day soon enough the sound of it can be improved.