If the bike has been set up with a power commander on a Dyno. And none of the filters have been changed to aftermarket ones and cans are still Oem ( check with old owner if bike was set up with the power commander as is or did he take bits off). I would leave as is. or if you do add the stage one and two dna filters and cans You should really put the bike back,on the dyno to get the best out of the power commander. But I would guess who ever put the power commander on the bike has had it set up to how the bike is now.so if bike is running nice. Leave it as it is. Just my opinion. You have the best thing on the bike ie power commander.