Includes: 1 Large Ratio Boost Assembly. 1 Stronger Pressure Regulator Spring. 2 O-Rings.
Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket