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MAGNUMTUNING FACTORY * Dyno-Boost is a fully adjustable, SNOWMOBILE SPECIFIC fuel controller designed for all fuel injected sleds controlled by ECU, simply wires inline with the IAT (Intake Air Temperature) also referred to as MAF (Mass Air Flow), MAP sensor and plugs into the O2 sensor harness on rare models having it. It tricks the ECU thinking the intake air much more cooler, then the ECU will send more fuel for a richer mix besides if the current sled (rare models) has oxygen sensor it tricks its signal to avoid ECU safe mode and low performance. It allows you to fully adjust the Air Fuel Ratio (AFR). Peppy acceleration, 15% extra horsepower & torque, lower quarter mile times & fine throttle response. Even people who are not technical minded will find, kit is not difficult to install just needs 20 minutes. It will not affect engine reliability & endurance. Remap factory engine or calibrate engine management to any performance exhaust, intake, etc. preinstalled. DYNO-BOOST increases HP by adjusting AFR between 12.7 & 14.7. Set advanced fuel trim, dialing a multi-turn screw. Adjustment needs no expertise. Chip modifies signals being read by the ECU, resulting adjustment to the AFR. Though performance chips are not especially for economy improvement & basically subjected to gain more HP, when modifying air fuel ratio, slightly at the expense of emission & noise level, efficiency of combustion is improved & you SAVE FUEL by up to 6%. This popular chip can even quickly be switched, removed or re-installed at any time. Magnum Tuning has been dealing with manufacture of upgrades since 1994. Our experience warrants peak performance, reliability & perfect style. Parts are made in Europe & covered by 10-YEAR WARRANTY. Not quite sure this ECU chip fits your needs? Magnum Professional TECH SUPPORT will review your requirements & advise you professionally.