Hearing the popping on decel after picking up the Rocket GT, I took it to a local shop with an exhaust gas spectrometer and it was running on the ragged edge of too lean.
Was fluctuating between 14 and 15 fuel to air.. Checked for an exhaust/header leak, but all was tight. Its not terrible with stock exhaust, but aftermarket would sound
like a piece of trash on decel... Love the bike, dont get me wrong, but no telling what a good fuel map would do on a dyno to turn on the HP.
I have a feeling Triumph detuned the fuel delivery system to get it under 170hp.. Fuel is the easiest way to do that after the bike is assembled with a computer driven map.