High Performance engines and forced inductions systems need and accurate amount of fuel delivered 100% of the time. S-Max fuel pressure regulators ensure that the fuel pressure required is available when you demand throttle response. S-Max -6 AN fuel pressure regulators are safe to use with all fuels and feature twin -6 inlet ports and a single -6 return with a standard 1:1 rising rate. The S-Max -10 AN fuel pressure regulators are designed for racing applications on fuel injected power plants producing up to 1000hp. The -10 AN features twin -10 inlets, also with a single -6 return with a 1:1 rising rate. Available in either polished red or blue finish, they look as good as they perform.