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Yamaha SR500 Chrome 41mm "Big Bore" Header Pipe 90139

Big Bore Stainless Steel Exhaust Header Pipe 41mm

This is a design, mixing the original Big Bore, and shaped like the 
OEM Header pipe.
Larger Radius; giving more space between the frame/engine
Designed to give more torque from mid-range RPM.

Single-walled design for maximum flow, optimal in combination with unrestricted intake like K&N air filters, tuning carburetor etc., easy installation at original mounting spots

41mm at connection joint 

Applications:
SR500 1978 and up