Fuel injected bikes like ours are designed to run very lean from the factory to fall under eps regulations. If you add aftermarket pipes and nothing else, you're ok, yet you may experience some backfiring on deceleration. If you add a fuel processor and pipes you're still ok but can still experience the backfiring and the fuel processor should be setup/ programmed accordingly. If add the open air filter kit and program it for both upgrades, you should be able to eliminate most if any backfiring, and the performance should increase quite a bit. It follows the principle of an engine being an air pump. Open air in and open air out, unrestricted, will provide good performance gains. You may lose minimal mpg, but gain maximum results. Again, I hope this answers your questions.
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