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Exhaust› Mufflers and Resonators

Speedwerx

LIGHTWEIGHT MUFFLER AC 858

$399.95 $315.08 Save $84.87

SKU: AC858M-CC

Out of Stock
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Speedwerx Lightweight Muffler is a ceramic-coated, mild steel exhaust component designed to reduce weight and enhance performance. It cuts 9.15 lbs from the vehicle's overall weight and features the brand's anti-bog deep snow technology, providing an outlet for exhaust in deep snow conditions to prevent bogging or hesitation. The muffler maintains a trail-friendly sound level, offering a stock-like sound with a deeper tone, and uses all stock mounting points and hardware for installation.

This muffler is specifically designed for 2025-2027 Arctic Cat CATALYST ZR, XF, RIOT, and M 858 C-TEC2 models. It comes with a performance guarantee from Speedwerx, assuring that it will not negatively impact the machine's performance. The ceramic coating is applied for heat retention and appearance.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandSpeedwerx
Part NumberAC858M-CC
CategoryExhaust
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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