Thank you very much for your reply Gregory,I have seen Pietsch MTX4 at the Euros and it had NT1's diffs at front,being the MTX4 uses the same bearings the RRR uses there's a good chance they'll fit into RRR too.
But then the RRR won't have the lowered diffs the R4 has and so on...But Shimo's car at the Worlds was very fast with the RRR diffs so I'm still undecided,should I go with the hollow shafts, lightweight crosspins and lightweight clutch bell or run stock 'till I can afford a R4?I can get those Kyosho option parts at a good price(VZW213 LW CB,VZW056 for the midlle shaft,VZW211 for the crosspins).Does Kyosho make a LW main shaft?I can't find...
Don't get me wrong,the RRR still is very competitive but the newer cars are much more hardcore.
Good racing to you all.
EDIT:Found VZW209 but it's titanium,i prefer a hollow one.