Hey Jorge, we have been running a M5B, with a MX 28011 head button, MX 6-T
glow plug, .7mm head shim stack thickness, 7.5mm restrict-or, Ninja medium header, and a 2073 pipe, 20% Byron's fuel. VERY impressive top-end, awesome driveability and 12 minute run time at lake park. If we could hook it up I would sacrifice some run time for OFF THE CHAIN/ ON-ROAD WORTHY power and put the 8mm in. Have not had any need to play with pipes. LET IT RIP