I did a few mods in my ex-toyota that really worked well without making the car more noisy or looking worse. I put out all air conditioning system which full weight was around 20kg (compressor, radiator, pipes & fluid). Thats completely free except the belt I had to buy so the water pump would still work. You can always put it back, the engine moves one item less and you remove all the weight from the front part of the car, perfect for all front wheel drive. I also replaced all the glass (except front one) with plastic material. There are different kinds depending on how much weight you want to lose and how fragile you want it to be. I shaved another 25kg using a plastic I bought for 50 per m2 (I only needed 2 m2) which was semi transparent, black coloured, more resistant, less breakable and less dangerous than the original, really worth it. I also changed both front seats for light cheap OMPs and replaced back ones with a glass fiber cover. I wouldnt recomend this for the GTV as the back seats are very light already and you wont get much for the work done. Another mod you can do is remove all interior of the car and drill holes on all non-estructural panels (doors, floor, etc), the car will look the same, sound a little bit more and be a few kilos lighter. With all this you can save around 60-100 kgs spending just a few hundred euros if you do it yourself (youŽll also enjoy and learn a lot). Getting 17" superleggera plus tyres would be a "little bit" more expensive and you will lose something like 10kgs from the car, it would look much better but run much more the same. Sorry for my english.