Product information YAMAHA TZ750 JL RACE EXHAUSTS. SET OF FOUR EXHAUSTS WITH ALLOY SILENCERS CR750GP JL Yamaha TZ750 Mild steel & Alloy Silencer STYLE: As original Construction is from 0.8mm mild steel exhausts. JL Exhaust Yamaha TZ750 exhaust system. More power less weight. Hand made product by the JL team of experienced fabricators here in the Czech Republic.