Speedwerx ECU Tunes // 2025-2027 Arctic Cat ZR / XF / RIOT / M 858 C-TEC2 Catalyst

Speedwerx ECU Tunes // 2025-2027 Arctic Cat ZR / XF / RIOT / M 858 C-TEC2 Catalyst

• Speedwerx ECU tunes for 2025-2027 Arctic Cat ZR / XF / RIOT / M 858 C-TEC2 Catalyst
• Stage 2 tunes for 0-5,000 ft and 5,000 ft+ on sleds with the Speedwerx pipe, Y-pipe, head and intake
• 500 ft stock drag flash for stock sleds (not for trail use)
• All tunes calibrated for 91 octane non-oxygenated fuel
• Ship your ECU to Speedwerx for flashing, or self-flash with an EZ LYNK tool and cables (sold separately)

Speedwerx part # ECU-858. Intended for closed-course competition use.

Not sure what fits your sled? Email kyle@freshiesbuilt.com with your year, make, model and track length.