Volkswagen Increasing Performance

I am looking for more horsepower and sportier suspension. How do I research what is available for my uneventful 115 HP non-turbo 4cyl Jetta GLS yr 2000? Any recommendations? Thanks.
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For higher performance gains (more than 40 hp), a turbo or supercharger will be necessary (in addition to the performance upgrades above). These may require modifications to the engine mechanicals (i.e. thicker headgasket to lower the engine compression, lower compression pistons, stronger crankshaft, etc.)
HTH
Volkswagen Scirocco Studie R