oversize exhaust valve - 39mm for M10 - stainless steel These +1 (39mm) stainless steel exhaust valves do not require that the valve seats be replaced (factory seats can easily be reamed 1mm larger). Valves are swirl-polished and slightly back cut. Price: $29.22   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.