if you are concerning about the weight
avoid sunroof, replace whatever seat you have with the racing ones, rip the rear seats out, rip all sound proofing materials (they are surprisingly heavy)
the only option that weights significant should be the sunroof and electric seats, otherwise those audio system and stuff dont really weight much
can you feel 50kg? yea sure you can, try kicking your wife outta the car and see if you can feel that, I mean like in terms of handling of course
if you wanna feel the weight loss, get lightweight(and smaller) wheels and brakes, those are obvious
as for flywheel and clutch, they are obvious in terms of dynamics (get the lightweight pulley as well, they can be very obvious)
dont be tricked into carbon fiber hoods and stuff, unless the whole car is in carbon fiber, one panel alone wont change much, its easier if you loss 10kg in the gym
if you are talking about 0-100km, I dont think the 20-30kg you save from the sunroof will change much on a 300hp+ car
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