Do I need Power Commander?

[Pete2]

I just bought Monster 800 model -04 (without cat). The local expert said that there is a lean point in the power curve at about 4000 rpm because that is the point where they measure the emissions. I also noticed that this is really so.

I plan to change the original exhaust to zard or similar. After that I think that the ECU needs to be adjusted. What are the limitations how the factory ECU can be adjusted? I would like to get rid of that 4000 rpm weak point and make the corrections that the new exhaust needs. Do I need to buy the Power Commander or can these changes be done to the existing ECU?

[MonsterHooligan]

you will need a PC to do the tuning.
i think the only thing they can do with the stock ecu is richen up the air mixture a little

jeff h
monsterparts