I purchased a z750 recently which has a MIVV slip on. The previous owner didn't retune it as he was told it didn't need it. I have read that new bikes are tuned from factory a little rich and retuning is a benefit. So if true even without the slip-on a tune, re-map (whatever it is they do) is recommended so I'm assuming with the slip-on it's even more important. I haven't ridden this bike much as restrictions still apply but the few times I have I can feel it's a touch rough, slight flat spot when accelerating then a little surge (not always) and sometimes a little popping, backfiring when engine braking. I'm also thinking about a power commander not for extra speed or anything but for a better smoother running bike. New air filter will also be added, K&N most likely. Any thoughts?