RPM Arctic Cat 858 Catalyst Titanium Chambered Q-Muffler

RPM Arctic Cat 858 Catalyst Titanium Chambered Q-Muffler

Gain extra power, drop massive chassis weight, and maintain trail-friendly sound levels on your new Catalyst chassis with RPM’s Titanium Q-Muf Quiet Mechanical Chambered Muffler! Engineered specifically for the Arctic Cat 858 Catalyst platform, the RPM Q-Series muffler is the ultimate upgrade if you want to keep your snowmobile sounding close to stock while enjoying a staggering 17 lb weight reduction and an instant +3 to +4 horsepower gain.

The secret to the Q-Muf's performance lies in its intelligent internal acoustic architecture. At lower RPM and closed throttle, exhaust gases are routed through a series of precision pass-through baffles and mechanical chambers to produce a deep, stealthy, quiet exhaust note. Under Wide-Open Throttle (WOT), exhaust flow fills the primary chambers and automatically overflows into high-velocity pass-through channels—allowing exhaust gases to vent freely without power loss, restrictions, or backpressure spikes, while yielding noticeably sharper throttle response.

Constructed entirely from 100% Titanium with fully welded internals, the Q-Muf weighs in at an ultra-featherlight 4.15 lbs total. The uniquely contoured oval-domed top and bottom muffler body eliminates thermal hot spots and exhaust dead zones, ensuring smooth scavenging and maximum exhaust velocity.

Performance Metrics & Weight Savings:

• Horsepower Gain: +3 to +4 HP Increase

• Total System Weight: 4.15 lbs

• Total Weight Savings: Sheds 17.0 lbs compared to the heavy factory muffler

• Material & Construction: Full Titanium Structure with Fully Welded Internals

• Sound Level Profile: Stealthy and near-stock at low RPM; free-flowing and controlled under WOT

• Warranty: Backed by RPM's 3-Year Manufacturer Warranty

• ECU Tuning Required: None (Direct drop-in, bolt-on and go)

Features:

• Smart Mechanical Chambered Architecture: Seamlessly balances whisper-quiet baffled trail riding with high-CFM, free-flowing exhaust performance under full load.

• Sheds 17 lbs of Front-End Weight: Drastically lightens the nose of your 858 Catalyst chassis for effortless side-hilling, instant pitch control, and deep powder flotation.

• +3 to +4 HP Performance Gain: Optimizes exhaust scavenging to increase horsepower and sharpen throttle response across the entire powerband.

• 100% Titanium Construction: Premium titanium build with fully welded internal chambers designed to handle extreme exhaust gas temperatures and harsh alpine conditions.

• Oval Domed Muffler Body: Eliminates thermal hot spots and fume dead zones to ensure a smooth, uninterrupted path for exhaust gases.

• 100% Direct Drop-In Installation: Bolts directly into factory mounting points and exhaust springs with no body modifications or ECU re-flashing required.

What's Included:

• (1) RPM SXS Arctic Cat 858 Catalyst Titanium Q-Muf Quiet Mechanical Chambered Muffler Assembly

• (1) Complete Set of Mounting Springs & Hardware

Fitment:

Direct bolt-on replacement for Arctic Cat 858 Catalyst chassis snowmobile models:

• Arctic Cat ZR 858 (Catalyst Chassis): 2025–2026

• Arctic Cat M 858 Alpha One (Catalyst Chassis): 2025–2026

• Arctic Cat Riot 858 (Catalyst Chassis): 2025–2026