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Resent studies have proved that piston rings cause 20% of the frication. loss in our internal combustion engines. The piston and ring manufactures have teamed up to solve this problem of H.P. loss caused by friction. It is not new and has been tried before, but the redesign of old designs are proving to be the way to go . Low pressure expanding rings, coupled with gas porting the piston is making added horse power on the dyno. I am going to need new pistons for 2014, that is the way I intend to go.