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Yeah on the turbo EJ2xx motors there have been some gains to be found with manifold swaps but only at huge power levels and they sacrifice low end power. However, the FA20 is a whole different engine compared to those so it will be interesting to see how well Subaru designed the factory manifold. And like the above guy said, most aftermarket manifolds are $1k+ in price.
In the past the NA engines have had pretty good manifolds, even for FI applications. Some guys even swap the NA manifolds onto the turbo engines.
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