At DMG Motorsports, we present the Yoshimura RS-4 Signature Series Slip-On Exhaust (SS-AL-CF), part number 234812D321 - a race-proven muffler built for riders who demand serious performance without sacrificing durability or style. Constructed from a stainless steel body with an aluminum mounting bracket and finished off with a striking carbon fiber end cap, this slip-on delivers the same technology found in Yoshimura's full exhaust systems in an easier-to-install package. Yoshimura's development work on the RS-4 platform has been proven at the highest level of off-road competition, helping capture AMA 450 Supercross and Motocross Championship titles, making this muffler a trusted choice for riders chasing that same competitive edge. Designed to fit as a direct slip-on replacement using your stock header, it centralizes mass, reduces weight, and sharpens throttle response while keeping exhaust note refined.

Features:

• Pentagonal-shaped muffler design maximizes internal volume without adding bulk
• Polyresonant duplex front chamber acts as a muffler within a muffler to reduce sound and save weight
• Stepped, two-stage core baffle improves mid to top-end power delivery
• Stainless steel body with aluminum mounting bracket for a clean, lightweight, long-lasting build
• Carbon fiber cone end cap adds an aggressive, race-inspired look
• Robust clamp connection to the header pipe and a welded (not riveted) mounting tab for long-term durability
• Spark Arrestor/Sound Insert compatible for closed-course and off-road use requirements
• Race-proven technology derived from Yoshimura's championship-winning full exhaust systems
• Designed to fit a standard, factory-equipped motorcycle for reliable, direct fitment

Fitment