I finally got my hands on a Minarelli performance exhaust, ordered this from Italy before those Mambas came back in stock on the Buy/Sell forum.
I was kinda shocked at how SMALL it is. You guys think I might get better performance with a Mamba or a modded Estoril? I mean I definately noticed a difference from the stock exhaust (rejetted to 59, from 56 previously and 52 before upgrading the carb). I still need to do port matching. This seems more exotic than those other options but I didn't get quite the performance kick I expected (though its my first time upgrading an exhaust so what do I know).