thanx for your replies.. you said "We know the car weighs 1455kg in std trim" did you weigh the car in standard trim? i am asking this because when i removed the rear seats and replaced oem front seats with sparcos the car was still weighing around 1450! i should have weighed the car before removing anything. mine had a sunroof and leather interior as optional.. what sort of material are you using to get a flat floor? i am also trying to improve the aerodynamics but without a rear wing.. BTW any info on the brake specs?