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Exhaust Torque Valve Insert SR400 SR500 XT500 & TT500 2-089

High Performance Torque Valve

For more torque and power, but at lower RPM, resulting in top performance.
Feel an immediate difference in low end TORQUE and POWER without taking anything away from the top end!
See photo graph for SAE corrected horsepower using a stock 1979 SR500, which achieved a 3.5-4 horse power gain!

Applications: YAMAHA e.g. between cylinder and header pipe

SR400

SR500
XT500
TT500