For me, the best are 40wt and kit piston, in all 4 shocks. I tested, this weekend some things, the new shocks, from RS, are better than the originals E4, the nylon pulleys work well, but in the center axle is best the alu pulley, because with the nylon, the belt jump from pulley.
The top deck, from RS is more flex, and work very well with the original chassis, and the last test, is the overdrive like touring gas car, I tested a 34T pulley in front, from Xray, this change front ratio to 2, i feel the car more aggressive, and a little more fast into the Slow zone of track, no differences in speed, and more consumption of front tyres, but i need some more packs, for clear conclusions.
Greetings, Luis C.