I took out the air con which was heavier than I thought, rear seats, plastics, seat belts, spare tyre, everything outta the back. I did notice that the car tended to steam up more than before and it was considerably colder in the winter months inside the car, but it did improve the acceleration and handling a bit. My turbo used to boost a max of 0.9 bar on hard acceleration, then after I stripped it it boosted to around 1.0 so theres a bonus to taking the heavy shit out.