Never having owned or done huge k's on a "real" Guzzi, and having only test ridden them back in the '70's, it's difficult for me to comment, although the first time I rode a Breva 750, my overall impression was that it felt "revvier" than what I remembered.
Those Breva 750 owners with Staintunes fitted report an improvement....a less restricted feel (even revvier maybe????)
I recall seeing something on the Staintune site about fuel injection but haven't met anyone who's gone down that path.
I would be interested to hear if anything can be done, but I've been having enough fun with the Breva in standard trim, to not really be bothered thus far.
I did notice an increase in performance after fitting the Aprilia/MG 1200 Sport mirrors to mine
