My choice would be Weight reduction - as it enhances the other 3 aspects.

People start with power, handling and brakes because they dont decrease the comfort in a road car.
if you want to decrese weight i would remove (probably in order)
-spare tyre and jack
-stereo (incuding the 15kg of sub )
-sound deadening (not sure if GC8's have it in the doors??) and bonnet lining
-back seat/door trims/passenger seat.
=maybe 100kg all up!

can anyone think of more?


Steve