maybe clutch and gearbox,(i have the z20net but on the origional f23 clutch and g.box)
the handling feels fine except maybe i want something a little stiffer.(i could still be getting used to boost mind) other than that i dont really know, i still have my fingers crossed on mine.
im sure once im back to the rolling road ill be much happier.
its in the back of my mind it'll chew it up but the engine would have to come out again either way if i change it so ill just see if it pops! nothing ventured nothing gained!
(at least ill be some way ahead of you for any precautionary warnings!) 😃