The GPR Trioval slip-on exhaust for Yamaha WR400F delivers enhanced performance and sound. This exhaust system improves power output while maintaining legal sound levels. The Trioval design features a 100mm x 130mm diameter and polished stainless steel construction. The system weighs 4.29 pounds, reducing overall bike weight compared to stock. GPR crafts this exhaust in Italy with precision welding and quality materials. The exhaust includes all mounting hardware and a removable DB killer. Yamaha WR400F Exhaust Fitment Yamaha WR400F 1998 1999 2000 GPR Exhaust Information Removable DB Killer: Included Weight: 4.29 pounds (1.95 kg) Length: 15.75 Inches (400 MM) Finish: Polished Stainless Steel Link pipe: Included Catalyst: Not necessary for this product European Homologation: Yes Yamaha WR400F GPR Trioval Slip-on Exhaust Details Enhanced Performance: Optimized exhaust flow increases power output across the RPM range Superior Sound Quality: Produces a deeper, more aggressive tone while staying within legal sound limits Premium Construction: Hand-polished 304 stainless steel ensures lasting durability and corrosion resistance Easy Installation: Includes specific link pipe and mounting hardware for direct bolt-on fitment Weight Reduction: Lighter than stock exhaust system for improved handling characteristics Quality Assurance: Italian craftsmanship backed by a 2-year international warranty