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the RS-4’s premium muffler packing helps meet the USFS noise specifications
Measures 406 mm (16") x 356mm (14") x 254mm (10") expandable to 343mm (13
Part No 4604-408 Medium Green & 4604-409 Orange Fit:
Warmth Rating Max 2
Arctic Cat Snowmobile Rail Brace Kit Part No:8639-170 the RS-4’s premium muffler packingWeights 1. 2 LBS per pair with rivets (8639 291 & 8639 290), 8639 170 is 7. 5 LBS Reinforces entire mid section of suspension rail to resist bending Fitments Part No 8639 291 Fits: 2021 2022 Arctic Cat M A1 154 165 INCH Models 2021 2022 Arctic Cat Riot X 146 INCH Models Part No 8639 290 Fits: 2019 2020 Arctic Cat M A1 154 165 INCH Models Note: 8639 290 only fits 2019 2020 rail. If you replaced your rail with a 2021 rail you need Part No 8639 291 Part
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