I didn't think it did it until I followed it in my girlfriends car one night.
My motorbike does it also when I have the Akrapovic exhaust fitted, just unburnt fuel igniting, little blue flames inside the exhaust.
 
but not well supported from the factory with a 'group n' kit (though I think they did produce one for the LCR)
 
odd class structure then....

Is this an actual grp N exhaust being mentioned here tho or one which is just being called N