A guy I know has just supercharged his 325 ragtop (94M) he reckons power is up to @280 Bhp.

Is this correct seems a big power jump just through bolting on a supercharger ??

I went out in it with him the acceleration is scary, shame that the current suspension set up (for comfort) & brakes are not up to it :)

An 88bhp jump does seem a little on the optomistic side if nothing other than S/C has been added.

IIRC 325's have over 190 Bhp to start with, so a 90 Bhp gain off a Supercharger is quite possible.

Rule of thumb is 40% extra for a supercharger and 70% for a turbocharger-190+40%=266 so it's not unrealistic.