Arrow Thunder Slip-On Rear Muffler Yamaha WR from model year 2026, with EC type approval, carbon end cap

The Arrow Thunder Slip-On muffler gives your Yamaha WR 125 R a sportier look and a more powerful sound, while also reducing weight compared to the stock exhaust system. The popular Thunder series combines modern design with high-quality craftsmanship and was developed specifically for current Euro 5+ models.

The silencer features a black dark aluminum outer shell with a carbon end cap and is mounted directly onto the original header as a slip-on system. Thanks to its precise fit, installation is easy without requiring any modifications to the original exhaust routing.

Technical Specifications

• Manufacturer: Arrow
• Model: Thunder
• Part Number: 52513AKN
• Type: Slip-on rear silencer
• Street legal: Yes
• Outer shell: Dark aluminum
• End cap: Carbon
• Inner material: Stainless steel
• Intermediate pipe: Stainless steel
• Muffler length: 350 mm
• Inlet diameter: 35 mm
• Exit diameter: 45 mm
• dB killer: included
• Mounting bracket: welded
• CO sensor connection: No
• Lambdasonde connection: No

Fits:

• Yamaha WR 125 R, model year 2026

Note

• Suitable for Euro 5+ models with dual lambda sensors
• Uses the original manifold
• Installing Arrow manifolds or connecting pipes may cause error messages
• Welded-in dB killer – cannot be removed without structural modifications

Scope of delivery

• 1x Arrow Thunder Slip-On muffler
• 1x connecting pipe
• Mounting hardware
• Installation instructions