...any of the couple dozen older bimmers I've owned. It beat my wife's '73 Bavaria booster hands down, all my 2002s including '72 and '74 tii, 635CSi, 3.0CS, 2800Cs, all of them.
All I can remember, nearly 40 year later, was that it was not the "thick" booster, was not the tii (7"? diameter)...