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The FR-S, even though the engine is based on Subaru EJ, may not be compatable for swaps from older Subarus. Let me explain.
The newest evolution of the EJ block, used in the new Legacy GT, uses a front-mounted turbo - this means less lag, but no burble; and it would get in the way of the older Subie subframes.
SO, new EJ's in Lecagys use a different mounting place. There's to mounts in the back sides like earlier EJ's but then one front and center just under the crankshaft pulley (is what it looks like to me).
This is probably what Toyota took to modify, because it's the newest. Furthermore, the exhaust manifold shown in pictures of Geneva auto show etc. looks like the new Legacys and not like older subies.
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