Precision CNC-machined forged aluminumAdjustable oil pressure regulator adjust without removing plate from the enginePassage plugs are removable for serviceRebuildable bronze pinion shaft bushing in all models and bronze cam bushings in 07-later styleMade in the U.S.A.S&S oil pumps for '99-'06 are not compatible with S&S cam support plates for '99-'06 engines. All S&S cam support plates are machined for '07 and later style oil pumps.