I recently installed a full CS Racing Exhaust. Upon first fire up I didn’t install the DB killer in the bike but I noticed the idle going from 1000 to 1200 RPM. Almost like surging. The mods done to my bike are, CS Exhaust, “Air Box Mod”, Exhaust servo eliminated, Block off Plates Pair Valve and O2 sensor plugged. I sent my ECU back to Dano’s he was the one in originally did the soft tune when I first got the bike. After getting the ECU back it does the exact same thing Dano told me to install the DB killer to make it stop because these bikes are sensitive to exhaust back pressure. I’ve seen videos with people with no DB killer and it doesn’t have the lumpy idle. Does anybody else have this issue when they installed this exhaust or any full system?