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Impreza GD 2.5 WRX STI 280hp 2005-2007

Impreza GD 2.5 WRX STI 280hp 2005-2007 

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Impreza GD 2.5 WRX STI 280hp 2005-2007
The only 2.5 of the GD generation, the Impreza WRX STI 280hp built from 2005 to 2007 runs the EJ257, and this is the one GD page that reaches the cylinder head. It lists FERREA Competition Plus intake and exhaust valves in sets of eight, OEM size and +1mm, the SUPERTECH black nitrided stainless intake valve 36x5.96x105.9mm, the COMETIC reinforced head gasket with 101mm bore for EJ255 and EJ257, ARP head studs, ACL Race Series and KING RACE tri-metal bearings and VIBRA-TECHNICS mounts. Forged pistons and rods: see '2.5L 16v - EJ257'.