Stage 1 Single Beehive valve spring set for the 03-06 Evolution 8 & 9 uses the factory spring seat and the factory retainer. This is a great option for those wanting to run GSC S1 or S2 camshafts on a street application, or anyone wanting to run more than 11mm of lift on the intake and 10.6mm on the exhaust. RPM limit 9,000.
The Stage 2 Single Beehive valve spring set, includes new 4340 Chro-molly spring seats and Titanium Retainer set. This kit is capable of 11000+ RPMS, with as much as 12.5mm of lift. This is a must have for anyone pushing the limits of their Evolution. If you have had problems with valve float or throwing rocker arms this is the spring set that will cure your problems.