Stavros

I cant find any proper spec, as get the impression the US versions were de-tuned and all bhp figures etc i can see seem to belong to them...

Bhp, torque, perf figures, and what they drive like?

Also, any idea how much difference a Piper cam makes to that engine?

vroooom ptssssh

http://en.wikipedia.org/wiki/BMW_E28 ?

http://www.reference.com/browse/wiki/BMW_E28

assume you want EU specs

Stavros

Like said mate, they US specs in both them links, and im pretty certain US spec 535s were de-tuned compared to Euro ones...