High Flow Intake Kit // 2025-2026 Arctic Cat ZR / RIOT / M 858 C-TEC2

Speedwerx High Flow Intake Kit // 2025-2026 Arctic Cat ZR / RIOT / M 858 C-TEC2 

Our High Flow Intake Kit is key to unlocking maximum power and performance on the 858- we are seeing a 5hp gain by opening up the restrictive stock plenum! Includes billet aluminum adapter with rubber seal, three Frogzskin vents, and installation instructions.

Preliminary testing has shown a 18hp gain with our Pipe, Y-Pipe, Stealth Head, and Air Intake with at high elevation! We will be offering our Exterminator Kits for a complete package that include these parts plus an ECU Tune and Hypershift Clutch Kit for maximum power and performance in a bolt-on kit. Update 2/28: an ECU Tune is required with the Pipe/Head/Intake combo- see related products below.

TECH NOTE: Power Valve cables- we have seen a large number of sleds that the power valves are not set properly from the factory or they have moved, this dramatically effects the overall performance of you machine. Using AC tool # 836-00005 you need to confirm these are set right and if you have issues check them again. In our opinion, this is needed on every single 858 out there even in bone stock form. There is also a Technical Advisory regarding the Servomotor Bracket Alignment issued 12/5/25- your dealer may have already contacted you about this done this as part of the pre-delivery inspection, but they can help you with these adjustments if you are not comfortable doing them yourself. You can purchase the Adjustment Tool Kit here- https://speedwerx.com/apv-adjustment-tool-kit-858-c-tec2-models.html