RS-12 Stainless Slip-On, w/ Stainless Muffler for the 2025+ Suzuki DR-Z4S and DR-Z4SM

The Yoshimura RS-12 Enduro Series Slip-On Exhaust (116612S521) is a premium, 50-state emissions-legal performance upgrade for the completely redesigned 2025+ Suzuki DR-Z4S and DR-Z4SM. Developed and manufactured in the USA, this slip-on system drastically reduces overall vehicle weight by 4.4 pounds compared to the bulky factory muffler while delivering that deep, unmistakable Yoshimura exhaust note.

The RS-12 features an asymmetrical, intelligently designed muffler profile that maximizes internal volume to help manage sound levels while increasing performance. Riders will experience a dyno-proven 4.1% increase in maximum horsepower at 8,000 RPM and a 2% boost in torque at 4,800 RPM. Constructed from high-grade stainless steel with Yoshimura’s exclusive "Works Finish", the exhaust is topped off with a sleek matte carbon fiber end cap. It includes a pre-installed USFS-approved spark arrestor and a custom stainless steel heat shield, making it ready for the street and the trail right out of the box.

Features:

• Performance Gains: Delivers a 4.1% increase in horsepower (@ 8,000 RPM) and a 2% increase in torque (@ 4,800 RPM).

• Weight Reduction: Shaves 4.4 lbs off the motorcycle compared to the OEM factory exhaust.

• 50-State Legal: Fully compliant with emissions regulations, keeping your dual-sport 100% street legal.

• PTF Insert System: Patent-pending Precision Taper Fit (PTF) ring simplifies the removal and installation of sound inserts and spark arrestors.

• Premium Construction: Stainless steel muffler body with Yoshimura's durable "Works Finish" and an aggressive matte carbon fiber end cap.

• Trail Ready: Includes a pre-installed USFS-approved spark arrestor for riding on public lands.

What's in the Box:

• 1x Yoshimura RS-12 Stainless Slip-On Muffler (Carbon End Cap)

• 1x Custom Stainless Steel Heat Shield

• 1x USFS-Approved Spark Arrestor (Pre-installed)

• Model-Specific Mounting Hardware

• Installation Instructions

Fitment:

• 2025–2026  Suzuki DR–Z4S & DR–Z4SM

Fitment Notes:

• Emissions: This is an Enduro Series slip-on, meaning it retains the factory catalytic converter located in the OEM header pipe, making it 50-state street legal.

• Works Finish Care: The Yoshimura "Works Finish" is a unique surface treatment that undergoes a distinctive color change after it goes through heat cycles, developing a beautiful bronze patina over time. To maintain this finish and prevent spotting, clean the exhaust with mild soap and water, and occasionally wipe it down with a specialized stainless protectant or WD-40 after washing.

• Slip-On vs Full System: Because the new 2025 DR-Z4S utilizes modern fuel injection and ride-by-wire technology, emissions equipment is tightly integrated into the chassis. Opting for a slip-on exhaust like this RS-12 allows you to drop substantial weight, gain throttle response, and drastically improve the exhaust sound without the hassle of ECU flashing or dealing with "Check Engine" lights commonly associated with removing the factory header and catalytic converter.

Sound levels with spark arrestor (J2825 standards):

• 2000 RPM: Stock – 74.4 dB / RS-12 – 86.0 dB

• 5000 RPM: Stock – 84.4 dB / RS-12 – 89.3 dB

Yoshimura part number:  116612S521