Subaru's boxer engine is the blood pressure raising, adrenaline pumping, addictive monster that keeps us enthusiasts begging for more! And FastFlat4 offers many products for enhancing the boxer/flat 4 engine.  Internal engine upgrades such as cams, high performance valve train, pistons, rods, bearings, head bolts and complete short block and cylinder head packages are just some of the products offered.  Also a great selection of intakes, turbos, intercoolers and all supporting performance products needed for the proper and complete install.