The GR86/BRZ added those in 2022+ but didn’t offer a way to control loudness, using a small board attached to both the canbus and the audio system. It is, in online enthusiast communities, disliked for providing ‘fake’ horsepower and for being ‘too’ loud. So: they can, but if the manufacturer gets it wrong, then it’s much worse.

This solution also misses that for many folks in the U.S., imposing the emissions of a V-8 engine upon their environment is not just about how it sounds in-cabin, it’s about marking territory, and V-8 engines are quite good at that. You would need a subwoofer to broadcast it properly and you would likely run into amplified sound laws in many regions that are not applicable to engine noise.