The placement of that mass might be a factor. Eg saving 8kg "at the swinging end of the pendulum" (window area in top third of the car) might be better value for handling than saving 8kg low-down right in the centre of the car.

Similar to weight savings on rims and other unsprung/rotating mass is excellent value for acceleration/braking versus saving the same mass elsewhere.

Yes obviously its high in the car but the fact still remains its a pain in the ass.... lol.

Its just the question can you live with it like that... lots of compromise on a race car but the lose of a functioning window is a big one for getting on trailers etc etc...

You can get plexi glass with mini window slots in them. Not as functional as a full window though

Ive had these guys bookmarked for a while, can order any different thickness and add sliding vents etc

Same as plastics4proformance.

I got a proper quote off them and it was close enough to 1k for a set of 4. They need stuffners etc and they will all recommend to go 5mm for motorsport use etc... And the price just keeps going up... All 'proper' options Ive looked at lose the use of the window.

Pulling significant wieght out of a car isnt all that easy. Once you have done the basic stuff like carpets, interior, spare tyre, tools etc then you need to start getting creative with it. And after that, there wont be many big ticket items. Instead it will be the culmination of all the little small things to hopefully add up to something substantial.

Pulling sound deadening off, gutting doors, boots. Roof and bonnet reo bars etc is one way. Glass to plastic. Removing latch mechanisms and fitting lighter quick release / aero latch type things.

Pulling out the HVAC system (in engine bay AND under dash).

Stripping all the under side body deadener shmoo off. Stripping the seam sealer out of the cracks (and stitch welding the seams while your there.)

Removing the booster, and ABS system and fitting a race pedal system. Remove the hand brake system (including using rear rotors with removable on non-existent drums. My biot rear rotors can remove the hand brake drum totoally from the alloy hat.

Cutting off the front end and build a basic structure.

Can also start replacing the critical components with lighter wieght options. Investing in premium wheels, brake rotors, driveshafts. Remove fuel tank and fit a smaller fuel cell. Lithium battery.

Cutting the spare wheel well out. Cutting additional layers of sheet metal off. (Often there will be sections of the car where multiple layers of pressed sheet metal are spot welded together to make things like the box section where the seats mount or stiffen up-rights pillars which might not be as critical once the car is caged.)

Replacing panels and doors with CF. There is a fair bit of support in the aftermarket for the GD chassis.

Can also either gut and un-pick the OEM wiring loom for a bare bones system, or replace with a new custom made item. There is ALOT of wieght in the OEM looms.

Pull the entire dash out.

Replace no critical bolts with plastic bolts. (Or cable ties )

Titanium pipework. Cut the exhaust off - side exit - bonnet exit.

Unfortuantly, once you have done the easy stuff, then it gets harder and harder, and more and more expensive, and you get less and less gains.

Could also take pounds off the driver if hes a big boy.

whoops, was supposed to quote plastics4performance website link haha

Yeah the p4p stuff is supposed to be awesome but yeah its very expensive once you add up everything.... Yeah Bram Im prob 2/3rds through your list of weight saving....

Weight is king. Im happy to run with 210kws if I can get the car down to 1140kgs ish!

Lithium battery saved me about 13-14kgs (probably only 10kgs for a GC/GD as they habe a smaller batteey than a SG.)

In any case, more improvement than the 8kg saving you get from plexan windows. And comparibly priced.

What are you down to now?

Those doors you got look the goods