I think that c30 and prorace pipes isn't good for this cylinder because:
1. c30 is better and it is universal pipe and i know one phrase. that what is for everything is useful for nothing... no maximal power for each cylinder
2. Prorace pipe is good because it matches whit cylinder ( if you 'll use pro race cylinder) , but! there is one big problem, pipe is built for MK pr2 (stock) ports, how could see you had ported it... so better take some roost pipe only for special parameters for your cylinder...
pipe or exhaust is most important thing in 2 stroke engine !!!