from your experience tell me what you know about weight reduction, such as specific car seats, panels and more in particular DIY jobs that reduce weight. thanks.

Start with the basics really... Its been stated on these forums before that just acquire some dry ice and pour it on the sound deadener, should peel off. Seats of course can come out but depending on your state you may need to get it engineered for the rears removed or you cant altogether!

Replace front ones with carbon-kevlar units, if you wish to go to extremees then get some carbon fibre or FPR panels made, lightweight suspension components, titanium exhausts, stripped interior, lighter flywheel, using lexan/perspex for windows.

Thats going to extremes though

far out man how light do you want the car lol. why dont you make the panels out of balsa wood.

hole saw everything you can! less metal in not structural areas = go faster!

I,m doing the same thing, Perspex (all side windows),sound deadener removed (Hint: dont use a heat gun like me!), lightened flywheel etc and Taiwanese panels. I'll gut the interior after licencing, not a good look at the pits!
Oh and alloy diff centre & lighter seats not kevlar though:(

If you have a coupe throw out the back seat it weighs a fair bit.

the car is already light, any lighter you just need wings and you will fly.. remember the car is small and fragile,650 kg ute..

Yeah hit 185kph+ and the front end gets VERY light, kind of scarey.

i believe the ute is suppost to weigh 690kg (but really it would way a bit more)
and my ute after the ca18 conversion weighs 920kg (its on the rego papers)
as you can see, its not all that light anymore...