Shock pistons.
Whats the size most people are running?
I took my spare buggy shocks and found that the previous owner did some mods to rear pistons. He filled in the holes on 1.4 and drilled them out to I think its 1.0 or 1.1 mm. He also did that cap mod where he drilled out the hole and did the bladder mod and put foam in cap. I refilled the shocks with 40 front and 37.5 rear both with grey springs. I will have to wait to get to track to see how this works.
My main buggy had 1.3 in front and rear.