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designed for high altitude riding, this system is quite happy on a bone stock CTEC 800 here at 1000

Cat 800 & TCat, Polaris 650 Patriot, SkiDoo E-TEC 600 & 850, Ace Turbo

RPM, torque, BMEP, IntakeAirVelocity, 2cycleVS4cycle, portTimingVSvalves&camTiming, BoreVSstroke,

Compare Ctec800 2019vs2020, Etec 850 Etec 2019vs2020 and other observations

2017 early production renegade tested with 91.6 (R+M)/2 pump gas

Trying to make sense of the occasional HP fade that not all 850s experience.

Cat 600, 800 & ZR9000, Polaris 600, 800 & 850, SkiDoo 600R & 850, Yamaha Sidewinder SRX

Craig Campton, Glenn Hall, Dan Fisher and race sled owner Scott Laskowski raise the bar at DTR

optimizing fuel flow and ignition timing with a Dynojet 11-029 tuner, plus a test of the SSI stock pipe “mod”…

Excell stainless muffler, PCV with Dial-a-boost without touching ECU, then several D&D reflashes for even more HP

Ctec600, Ctec800, Etec600, Etec800, Axys600, Axys800, Sidewinder

Dave Morris’ Red Cup Racing Super-Stroker Suzuki, tested as run at HayDays and with boost turned up even more

Speedwerx 2.25″ and 2.5″ stainless quiet mufflers tested with Precision EFI stage I, II, and III ECU reflashes

optimizing fuel and timing for max HP with both 5% and 15% ethanol pump gas. Low buck HP improvement!

compare stock to Aaen, SLP, and new SSI titanium single pipes

Stock, mod stock muffler, Tec2 muffler PCV, Tec2 muffler PCV dialaboost, Tec2 muffler dialaboost w/ reflash ECU!

AmSnow/DTR shootout sled tested wth 91 nonethanol and 12% ethanol fuel, various timing while still inbreakin mode.

Could this be the 2018 Polaris Axys engine?–proven reliable, tested here with stock and Jaws single pipe.

2017 Arctic Cat ZR8, ZR8, ZR9, Polaris Axys6, Axys 8, SkiDoo Etec6, Etec850, Yamaha Sidewinder

Adding the proper amount of fuel to compensate for high flow mufflers = maximum safe horsepower!