The same sort of money that usually gets you a humble cast iron cylinder will buy you a very robust plated Stage6 aluminium cylinder here.
A comparatively tame exhaust port timing together with a huge port area make for an extremely torquey kit which will also rev very nicely. There are not many cylinders powerful enough to stand the Pro's pace off the line.
A reliable cylinder complete with high quality piston and gasket set. 

Liquid cooled version for Peugeot upright engines

Use BR9ES plug with this kit

Stage6 S6-7017501