Originally Posted by dscoobydoo
There were no USDM 2.0 engines that are similar. Except for the block and a few other oddities, you pretty much use the EJ251-3 parts on this swap.
Sadly, I found that the EJ203 had different specs depending on the year and car, so it may only be 145 hp
The usdm 02-05 wrx ej205 shares the same head gasket. Don't say NO usdm cars share the same parts.