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In addition to the aforementioned header, CAI, cams, ECU, underdrive pullies and a good exhaust system, you could add a lightweight flywheel... it should free up a few HP. There's not too much else to do NA though, because believe it or not a lot of the SE-R's stock components work fine up to maybe 180 wheel HP. Throttle body, MAF, injectors, plugs, wires, valvetrain, internals (pistons rods etc) intake manifold... all that stuff is fine until you go forced induction, then you'll need to change some of it.
The SE-R's stock throttle body is the size Mustang owners UPGRADE to. You will *never* need to touch it for any reason. The MAF is good to 250 HP. the stock internals can handle 400+ HP. This is why turbo systems are so popular with SE-Rs... the motors can easily take the abuse. NA, you won't even push most of the stock components at all.
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