good to see you posted this in the accent forum but try and keep it to one thread only.
i can't guide you on the exhaust but a lot of us accent guys get better results out of short ram intakes (sri) or warm air intake (wai) these are the same thing, just two different names. i got mine off ebay and haven't had any problems with it. just search for hyundai accent intake and then consider upgrading to a better filter.
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