it has less rotating mass, thus rpms will drop quicker....
if you take an empty shopping cart and push it at say 10mph and let it go...it will stop relatively quickly
if you take a full shopping cart with 10 bags of 40lb dogfood and push it at 10mph and let it go...it will take a while to stop
more mass
more momentum
more time to stop
less mass
less momentum
less time to stop
ultimately, when you let off the gas and pop the clutch, the engine will go down to idle as fast as physics allows it to do.
fidanza, os giken, ogura, stock lightened will all do the same thing...slow down quicker
melloboy