From previous posts... with the Termi slip ons, you get an ecu, but are the O2 sensors still mandatory? I recall someone posting they were.
If that is the case, I will wait for arrow to have a full exhaust and buy just the racing ecu for the S model. I'm actually pleased with the sound clip, usually they sound f-d up, and that did not. It does sound like it freed up the bike from the stock exhaust some.
I'm starting to run into the same thing as I did on my S2R, any "at speed" time, you can't hear where the engine is at. I like to hear where the engine is at. I may eat my words of wanting to remain stealthy because at even 65mph -8%, you hear the wind and no bike. With ear plugs, you hear nothing.
Let us know how the motor feels with the new cans. Congrats!!!