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Nothing you're going to do to that car will improve its performance noticeably unless you spend much more than the car is worth. Do a regular tuneup and be done with it (I'm sure that the only reason your "special" plugs did anything is that the old ones were shot). You will not feel 5 hp gains, and most of the cheap crap that aftermarket companies pawn off won't even get you that.
The only possible exception to this that I can think of is timing. If you have a mechanical distributor, it might be possible to improve your throttle response a little bit by messing with it. You could also artificially improve the throttle response by modifying the throttle linkage. This does absolutely nothing to make the car go faster, but it can improve feel a little. You can also modify the downshift mechanism if the car is an automatic.
I don't see the point of swapping in another engine. That will cost much more than the car is worth, it will probably be very unreliable, and most importantly, a Hyundai's chassis will not handle it properly. Even if the car turned decent times at a drag strip, it would still drive like junk. The only difference would be that the extra power would make all the chassis deficiences that much more obvious. There would be no comparison to a WRX no matter how much power you gave it.
MrSelfDestruct, all fuel-injected cars I've ever seen come from the factory with a cold air intake. They're mounted behind the grill or somewhere similar. That air is about as cold as you're going to get it.
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