In weight sense, 20kg's or so.
You dont get xenon's or cilmate control (aircon instead) You get utterly horrendous charcoal cloth seats or if they were specified, Recaro Trendlines, they only come in Inferno Orange or Racing blue.
Aesthetically, nothing changes. You will not lose out on any form of space or passenger accomodation. In my opinion its a waste of time as a 182 with Cup Packs still comes with xenons and alacantra and leather seats (again Recaro's if spec'd) and the benefit of a stiffer chassis/suspension.
Performance makes absolutley no difference with only a 20kg's loss of weight in the Cup, that could be the difference of a full tank of fuel and a half tank of fuel.
It ofcourse is entirley you're decision, mind! Hope this helps...