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No matter what you do, I would recommend you do a FULL tune-up on the car before anything. If it has 100K+ miles on it, expect the Starter, and/or alternator to die in the near future as well, and make sure you have enough backup money to fix them when they do. Otherwise your walking for a little while.
KA's don't have the NA potential of a B series honda engine. your looking at MAX 160-170whp with all bolt ons, and cams, and s-afc.. stock they put down ~120-140whp depending on age and health.
Exhausts typically run $400-600
intakes are about $250
Header is about $350
That will net you about 15whp extra...
If your planning to swap, Get a nice exhaust thats 80mm.. get a silencer for it (cause it'll be load while your NA), and get a cone filter for your stock intake piping. Maybe hook up some sway bars if your into handling. That will put you near $1000.
That of course will only get you MAYBE 5-10whp, but your car will sound Much better.
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