I bought a 2000 IS that has the mario gears already installed,4th & 5th gear are vary tall gears with no sincros so it shifts a little hard ,but I really like it,its like having a 6th gear .when I am taching 3000 rpm in 5th Iam doing 90 mph,way diferent than my valk. standard was .I also just went to the darkside and love my Yokahama 205\55\r16 it handles like MT.
I did several Mario installs.
Valkyries have constant mesh transmissions, they don't have "syhchro's". the gears are always meshed. The mario gears have a different cut thats why they are so loud, and clunky.
This was my "review" after my first install.
http://www.jkozloski.com/Mario%20gear.htmYou can't get them in the states anymore anyway.