This is a genuine Subaru EJ207 2.0 litre shortblock. This shortblock is standard equipment on the 2002-2005 Australian STi. The 2.0 litre block makes a great upgrade for all WRX models. The Australian STi block features a semi-closed deck, forged rods and pistons for increased strength. This motor is physically a bolt-in for all WRX and STi models 

NOTE:

1. THIS IS NOT A COMPLETE MOTOR: This is a fully assembled bottom end, which consists of a block, crank, rods and pistons only. You will need to reuse your stock cylinder heads or purchase replacements.
2. The OEM 2.0L WRX heads will bolt-on for to the 2.0L short block, but there might be a change in compression.
3. For high-powered applications, we can also supply stronger forged pistons and rods, and we highly recommend the ARP head stud kit.