i have a carbon bonnet. also when i trackday or drag mine, i remove all interior other than front seats, dash and front door cards. when my roll cage arrives ill be stripping it totally with 2 lightweight buckets in the front. also removed my air con pump, rad and all associated pipework. that will weigth the most out of everything. unless you wany to hear every single stone ping under your chassis, dont remove the interior. there noisy enough with the interior in. if you want to remove as much weight as you can with it still being comfortable, ding the air con system, get either a carbon or frp bonnet and lightweight seats up front and dont forget the wheels, get some nice lightweight 4kg rims. gives you extra acceleration along with ditching weight. you can go hardcore like frp doors, wings , bootlid etc but then it gets silly. unless your racing it and not driving it on the road forget it. mine doesnt skip anywhere in a corner, point the front, nail the throttle and the back follows perfect. obviously thats as long as you have set up the geometry perfect, but even standard starbos dont skip round , they just feel like an unsteady boat on a rocky ocean