Raaze07 - Conventional Wisdom says that if you are only adding mufflers that you do not need to add an aftermarket ECM tuner, but I disagree. Now, I'm not a technician so my advice is immediately suspect.
But.... I added the MO's onto my existing setup (103" Big Bore Kit, SE Intake, HD Download and stock mufflers) and my bike immediately started running too lean. It seems that in my case the stock mufflers were the "bottleneck" in the system and since the MO's flow so much more air than the stockers, this put me into a lean condition. Since adding a Power Commander to manage the air/fuel ratio the bike runs much better.
Just sayin'....
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'04 Gold Wing - God forgave me for buying it!
'07 Road King Classic - God forgave me for selling it!
'08 Road Glide - It's the bike Jesus rode! 
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