This should give you some idea, redux
And we’ll say it again— the E28 M5 is not a big car! So imagine how small the M1 must be in the metal.
We find ourselves very tempted by the E28 M5 these days, by the way. What’s not to like? Well, hideous diving board bumpers and Natur interior (neither of which is seen here), for starters. Both US-spec, naturally.