well you will not be sacrificing performance, but comfort. You can remove the spare, sound deadening material, all non essential items like all the plastic trims in the engine, sub, replacing your stereo system with simple speakers up front only, replacing power seat with a non powered seats, trunk lining, then body panels with carbon fiber ones. I believe Cork Sport has a carbon fiber roof skin. You be deleting the sunroof also with that one. Get some 18" TE-37s, they will be lighter than the OEM rims. Don't fill your tank past 1/2 tank. Actually replace your cast exhaust manifold with a tubular one. Anything after that you be digging in to the interior panels and seats.
BTW:
This is the "How to", not the "How do I" section.