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2015-2016 Polaris 600 SwitchBack PRO-S
2020-2021 Harley Davidson FXST Softail Standard 107
2015-2016 Yamaha TTR50E
5A and 15A
2021-2022 CFMOTO UFORCE 1000
Spi XU-09537ES Exhaust Spring Valve electrical-lights-accessories-light-kits 2015-2016 Polaris 600 SwitchBack PRO-SForged one piece construction to help with weight reduction & improved flow. Performance valves receive a swirl polish, smooth stem treatment, and are made of 21 2n suh35ht stainless steel. Springs are made of swosc v material (oil tempered steel wire). Some springs feature a progressive style design with more coils on one end of the spring. Progressive springs are heavier on one end and should always be installed towards the bottom. Non progressive
