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Unless you're worried about emissions testing which has already been covered I'd go catless for the header and stock or a catted replacement front pipe.
EL will keep the sound similar to stock but louder. UEL will make it sound closer to a wrx.
As far as quality, you get what you pay for. Best bang for your buck imho is jdl uel at 850. Not sure about the quality of the soon to be built open flash header i would guess better than borla and fa20 but not jdl or nameless....
Keep in mind the power is very dependent on the tune.
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GR86 MT premium
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