I want to start with my satisfaction. This is an amazing quality product that does noticeably increase power. It also increases the intake sound which is absolutely amazing. But you can't just get the intake / Stage 1.
You simply need more than what the Stage 1 or Stage 2 kits offer. If you only get the Stage 1 ( Only Intake). If you get the Stage 2 kit that comes with another "Velocity Stack" which is a shorter, more tuned stack off of one of your throttle bodies that actually allows the intake to be installed as the OEM rear stack needs to be cut in order to clamp the Intake down. Stage 3 then comes with the "fuel dongles" that bypass the O2 sensors in order to achieve the correct fuel / air ratio with the given increased airflow which actually allows the new intake to deliver more power.
But then there's the SAS issue. There's an SAS system that pumps air from the stock airbox into the exhaust for emissions. By only buying the Stage 3 you also need a 5/8" pod air filter for the SAS system. You could purchase the SAS delete kit, but that's more $$ that you find out you wish you would have spend in order to get the whole upgrade done in one fell swoop.
This kit is amazing. My front tire has issues staying down more now because of it. Just get the Stage 3 kit with a 5/8" pod filter and get it done in one night, not a week.
I also want to give credit to Rottweiler Performance as every time I reached out to them I had a very quick, and professional experience and the information displayed on their website seems to be absolutely true. The Intake, Fuel Dongles, and Tuned Velocity Stack all seem like extremely high quality aftermarket products causing no detriment to the longevity of the bike.