Arrow

[Gumby 1100_imp]

The "rule of thumb" is that you can normally do one thing or the other without needing a fuel manager or ECU reflash. That is: You can open up the exhaust or the intake, but not both, without necessarily hurting your bike and running too lean.

Of course, there are always exceptions to such rules...for example: Fully debaffling your Arrow might result in a flat spot during acceleration or a slight dip in your torque curve. In a case like that, you would likely benefit from adding a fuel manager such as the PCV (Power Commander 5)...you may not absolutely need the fuel manager, but you would notice improvements.

If you do both exhaust and intake work, especially the kind of intake work you described (since you wrote "K&N Filters", it is assumed you mean removing the air box and adding 4 separate filter pods), you will likely need, and would definitely benefit from a fuel manager or ECU reflash, or BOTH (as some CB1100 owners have done...I recommend that you do a forum search on "ECU Reflash" or "Power Commander" for additional information).