Micro update.
The oem licence plate frame weights 10oz or .625lb, confirmed with electronic scale. The Carbon fiber frame weight 2oz.
By going with no licence plate frame, you save .625lb, by going with carbon fiber frame like this
one, you save .5lb or 8oz
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Power weight ratio of other cars (curb weight/flywheel hp):
S2000 (AP1) 2810lbs/240hp=11.70
S2000 (AP2) 2835lbs/240hp=11.81
NSX-R 2810lbs/300hp~310hp=9.3~9.06
Ferrari F430 3190lbs/490hp=6.51
Ferrari F360 3064lbs/395hp=7.75
997S 3131lbs/355hp=8.81
997 GT3 3075lbs/415hp=7.40
996 GT3 (2004) 3043lbs/380hp=8.0
996 Turbo 3480lbs/415hp=8.38
997 Turbo 3494lbs/480hp=7.27
C6 Corvette 3240lbs/400hp=8.1
C6 Z06 3130lbs/505hp=6.19
E55 (2003) 3857lbs/469hp=8.22
SL55 (2003) 4235lbs/493hp=8.59