Exhaust The FA20E and FA20F engines had exhaust gas recirculation EGR systems in which the piping was integrated into the intake manifold.
Injection and ignition The EJ251 and EJ252 engines had multi-point sequential fuel injection and centrally located spark plugs.
While the cylinder block had an open-deck design, Subaru claimed that lowering the water jacket achieved the same block stiffness as a semi-closed structure.
Relative to their EJ Phase I predecessors, the pistons for the EJ251 and EJ252 engines had reduced piston pin offset and a molybdenum coating to reduce friction.
Introduction Subaru's FA20E and FA20F engines were 2.
Intake The FA20E and FA20F engines had a plastic intake manifold.
Notwithstanding these maxima, peak boost pressure for the V1 WRX could spike as high as 22 psi 1.
For Australia, the EJ251 engine was first introduced in the in 1998 and subsequently offered in the , and.