304 Factory Sound Silencer

Boost 2-stroke performance with a proven, race-ready silencer. The Pro Circuit 304 Factory Sound Silencer is recommended for most two-stroke applications and is designed as an excellent replacement for the OEM unit while delivering impressive performance gains. With a longer midsection than the R-304, it’s tuned to strengthen mid-to-high RPM power—ideal when you want better pull and a sharper top-end without sacrificing reliability.

Its durable construction combines a 6061 T-6 brushed aluminum housing with stainless steel tubing and a stainless end cap, built to handle hard motocross and enduro use. Serviceability is also a priority: steel Allen-head screws make rebuilding and repacking straightforward, helping you keep sound levels and performance consistent over time.

Key features:

• ✅ Recommended for most two-stroke applications
• ✅ Longer midsection for stronger mid-to-high RPM performance
• ✅ Premium construction: 6061 T-6 aluminum canister + stainless tubing and end cap

Benefits:

• 🔹 Noticeable performance improvement over many OEM silencers
• 🔹 Durable materials and double-walled mounting brackets for long service life
• 🔹 Easy to maintain thanks to rebuild/repack-friendly Allen-head hardware and E-glass pillow packing

Technical specifications:

• 📌 Type: Slip-On Silencer
• 📌 Muffler material/finish: 6061 T6 Aluminum, brushed
• 📌 Tubing/end cap: Stainless steel (conical end cap, FIM-approved)

Why choose this silencer?
⭐ Pro Circuit quality and proven tuning for 2-stroke performance
⭐ Designed to be rebuilt/repacked to keep performance consistent
⭐ Strong materials and smart mounting design for demanding off-road riding