Well Rover did make 3-wheelers in 1903 but from 1904 it was strictly 4-wheelers. So here is my old Rover from 2004... before and after a bit of “computer enhancement”.
Naturally when you’ve a computer generated 3-wheeler you can have what you like ... so this is powered by a 3.5 litre V8 with eight straight through exhaust to make sure it sounds like a V8 should!!