PREORDER: This Muffler is currently in development and will start shipping beginning of November 2024

2025 Arctic Cat 858 Catalyst Mountain Muffler

Fits:

• 2025 M858 Alpha One/M858 Mountain Cat /ZR 858/Riot 858

Stock Muffler: 18.30 lbs 
GGB Mountain: 4.80 lbs 
Weight Savings: 13.5 lbs

Mountain Muffler

Aggressive sound

This muffler is a super lightweight, straight through flow design with an aggressive exhaust note. Sound levels would be considered as "Race" type are very loud when on the throttle. System fits securely in the stock location using stock mounts and is tested and guaranteed to provide performance levels as good as or better than stock.

GGB Advantage:

• Performance Guarantee
• Increased throttle response
• Aggressive exhaust note
• Huge weight savings
• No fuel mods
• Simple install
• Secure fit

Fuel and clutching mods are not necessary prior to installation. GGB two stroke mufflers are flow benched developed for back pressure against the stock muffler and will perform efficiently in any application where the stock muffler would be used.

GGB Mountain mufflers are designed to be used in areas where increased sound levels are not an issue. These mufflers are loud when you open the throttle. Please use accordingly. Sound level increase over stock (dbA) Idle + 4-6 / Under load + 10-18.