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spark force 3 4 exhaust system for yamaha Fits:15-24 YZF R1 (stainless steel collector with Force muffler) (GYA8828T) Fits most stock and selectSpark Force 3 4 Exhaust System for Yamaha Take your Yamaha's performance to the next level with the Spark Force 3 4 Exhaust System. Developed for top racing teams and tested on world famous tracks, this system delivers maximum power for both professional and amateur riders. You get the perfect balance of weight reduction, performance and pure racing sound. The 3 4 system consists of a 2in1 manifold to eliminate the catalytic converter and silencer.