SPI Lightweight Mountain Muffler Stainless, Arctic Cat Catalyst 858

Straightline Performance lightweight full stainless steel muffler for Arctic Cat Catalyst 858 models. Designed for mountain and deep-snow riding, this muffler combines low weight with durable stainless steel construction. According to the manufacturer, it weighs 5.30 lb / 2.40 kg, saving approximately 13.05 lb / 5.92 kg compared with the stock muffler. The reduced weight helps improve maneuverability and overall sled control.

The stainless steel construction provides excellent corrosion resistance for demanding riding conditions. Optimized exhaust flow produces a bold, crisp exhaust tone, while the muffler is precisely designed for the Catalyst 858 platform.

Fitment: Arctic Cat Catalyst 858, model years 2025–2026.
Weight: 5.30 lb / 2.40 kg
Weight saving: 13.05 lb / 5.92 kg compared with stock
Dimensions: 21 × 11 × 7 in / 53.34 × 27.94 × 17.78 cm