Its definitely a boxer engine. Just the add ons that we cannot see. The twin custom intake is a giveway.
700hp?? hahaha. You gotta be kidding. Most subaru with extreme mods have a hard time hitting 400hp. The boxer engine isn't that great to be moded. You can screw me up with Juns D1 machine for all i care. But its just too hard to make big HP even with an STi engine. Whats more many guys in UK swap engines with 2.5L US spec ones. Whats more the constant complaints by many tuners to make big power on the boxer engine.
see above quote. He have said everything.I think its RE engine