exhaust valve - 38mm for M10 - stainless steel Upgrade/Performance/Race These stainless steel valves are swirl-polished and slightly back cut. We find them reliable and think there must be a slight performance advantage over the factory valve. And at a great price. Price: $24.19   Quantity to Add:   CONTACT US AT BMWSALES@2002AD.COM 1-800-4-2002AD 909-629-1955 outside of the USA COPYRIGHT © 2002 AD, ALL RIGHTS RESERVED.