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First, welcome to AF!
Second, the RS isn't the best model if you are looking for performance. Believe me, I just sold my 99 RS and I'm buying a GSX. But, if that isn't an option for you, the intake, header(not headers), cat back, and pulley will probably gie you around MAYBE 20 hp. DO NOT get any "performance chips" they are a waste of money and do nothing for our cars.
Another route would be to save up for a custom turbo kit, or sell it and go turbo like I mentioned before.
Hope this helps
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