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Changing/altering the intake manifold, header, exhaust, and pulleys would yield you immediate improvements. The cheapest route to start is changing the intake manifold, from changing from a stock filter to a high performance re-usable filter all the way to a cold-air intake is one way. From there, changing the other components (header, exhaust, pulleys) will also cost more as you go along.

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10y ago
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Q: How do you up your horsepower for cheap on a 1992 Honda Prelude Si?
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