manston rep pipe is very bad....
its expensive... bad power and the quality isn so well, too!
use an yasuni c16.... it runs very very well on manston rep....
if the manston rep. is tuned you can use c20 or something like that....
ps: the cran will fix this setup.... there are no problems..... the crank is very priceless but the quality is very very nice for this price.... !