The Subaru EJ-33 is 230 hp with the factory ECU, but they haven't been made since the early 1990s.
The EZ30 came up in 1999 and was 220hp. Later they made a 3.6 liter version called the EZ36 which had 260 hp. These last two engines have variable valve timing.
The Subaru engines are pretty short and should fit where a 4 goes. I know for a fact the EJ33 fits in a Vanagon engine bay(designed for a 4 cylinder watercooled) with no problem at all. I don't think the EZ series is any longer than the EJ33.
I'm sure they're ALL cheaper than the Porsche engines. Honestly, it's a replica. Does it really matter what brand engine you use?
Stan: Overengineered? Not me! Not you!
The main thing with Special Edition is the ECU mapping. They use the ECU from a 2007 2.5 EJ Subaru engine. So that year range (approximately) is the only Subaru engine they use. I myself would love to use a different Subaru engine, maybe a turbo, but at this time its just not any option. Carey uses the 1st generation watercooled 911 engine (1999-2003?) because they have figured out the ECU mapping. Carey can correct me if I'm wrong and I apologize if I have said something incorrect or misstep. The ECU setup and making it work with the radio, A/C etc. is the big challenge. I'm sure my explanation is elementary but that is my limited understanding.