[cycleguy55]

I recall the Mach 2 from my youth.

I have no doubt cockpit noise from an engine mere inches from the driver's ears would be challenge. Notwithstanding, double wall glass and firewall with sound-deadening insulation would probably tame that somewhat - perhaps considerably. Automotive engineers have learned a lot over the past 50 years about how to deal with NVH (Noise, Vibration, Harshness).