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It is undeniable that backpressure robs horsepower, but as Aaron stated before cutting off your exhaust to make an annoying bumblebee will not help your horsepower either. The correct ways of raising your performance without becoming annoying is very simple. Create a better breathing atmosphere, colder cleaner and more air is the key. Give it a nice sound, if your stuff is old you run the chance of leaks, cracks, and low performance. Headers, decent exhaust pipe, and reliable/tested performance muffler. Change the oil, oil filter, fuel filter, plugs, wires, cap and rotor. Then have it tuned(by someone who knows what they are doing) and you will notice a great improvement.
If you are looking for anything more, then be ready to shell out the money. Your options range from 20v or 16v smallport topend. The lower end will cost you considerable more to change, just keep in mind, it was already stated a 4agze lower willnot increase power by itself. Changing the pistons, crank, and rods in the bottom end will however give you a larger HP curve to add to, and will in itself give you more options based on the compression ratio you build towards.
As another form of performance you have turbo, super, or twin charging your N/A, or just stop wasting time and do an entire engine swap and possible transmission as well if you are looking for a different gear setup.
There are limitless options as to what you can do with your car, it just depends on how much money you have and do you have the time and knowledge to do it yourself or money to pay someone. One of my boys is currently finishing up a 1jze(jap spec supra engine) into a Mazda RX-7. There are a lot of swaps that have been tried with the MK1, but feel free to explore and fill in the rest of us. Thanks.
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