Cat XF6000, 7000, 8000, Etec 600 & 800, Viper vs XF7000!, Polaris Indy 600 & 800
AmSnow Shootout XXIV Dyno certification of the 2014 stockers
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2014 Polaris Indy 800 Boyesen Rad Valve test
Compare drastic difference in fuel curve from 2013-2014, compare stock reeds to Boyesen Rad Valves
ZR8000 stocker compare aftermarket mufflers & Jaws single
horspower, dB, airflow, backpressure, and appearance