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Trapezoidal exhaust port Stub
Main Application is for PM55/59/84 exhaust systems when using cylinder kit PMCK0007/8/9 can also be used on all other cylinders applications.
Developed and CNC manufactured from 1 piece EN3B billet steel, to improve the dynamic flow of exhaust gases, by accurately matching the stub to the shape of the exhaust port oval transition into round.
The Gases can now flow without steps or faces which would normally create unwanted turbulence, thus improving the overall exhaust scavenging efficiency.
The increased flange thickness is no longer susceptible to distortion and no longer requires a gasket, it now incorporates a silicone O ring for optimised port to stub matching and improve sealing integrity.
