On a 620, as long as you don't open the air box or run a full exhaust the most you should need is a CO trim adjustment to the ECU. On a budget? Check out our "Parts for Sale section and any close outs or sales from our sponsors. There is a set of Termi aluminum high mounts there now
http://www.ducatimonsterforum.org/index.php?topic=63834.0 and Sil low mounts
http://www.ducatimonsterforum.org/index.php?topic=63717.0