I have a 2014 Ninja 1000 with the OEM side cases. I want to change out the OEM exhaust on my bike entirely. I would like to go with the Akrapovic headers because they come with a bung threaded for a 18MM O2 sensor (I plan on putting an auto tune unit along with a Power Commander V). But, because I have side cases, the only option I have from a dollar standpoint is the megaphone style (the 4 into 1 exhaust system doesn't clear the side cases, and two standard silencers are real spendy). Has anybody installed just the Akrapovic header with the megaphone slip-ons? If so, is it too loud for the street? My other choice is a full Arrow system, however, the header doesn't have a bung for the auto tune unit and the header would need to be fit for one. Any suggestions?