The 'base' RSX model is rated at 160 (flywheel) hp...so you're interesting in increasing output by 40 hp, and that's a moderate increase in power.Two approaches Honda 'tuners' take...one is via modifications not using 'forced induction' (i.e., by not supercharging, turbocharging). The other is to use forced induction.Also, you haven't expressed why you want the added power. Is it for track or street? Most often folks just want their car to be faster w/o serious racing interests. If that's the case, IMO, I'd avoid forced induction since it will cost you more to install, to operate (i.e., reduced fuel economy & added mechanical complexities/frailties), and will potentially shorten your engine's & car's overall drivetrain life. A more reasonable approach is to perform various modifications that use normal aspirition:- Cold Air Induction (e.g., AEM V2, or Injen, etc.)- Performance Headers- Catback Performance Exhaust- Performance Engine Control Management (ECM) computer or chip- High lift Cams- Hi flow Catalytic Converter (where approved by state law)If you perform all of the first group of mods listed, you could see perhaps a 40 hp (20%) gain. Honda after all performs most of these mods from a factory-released platform that they call the Acura RSX 'Type S', and that car cranks a little over 200 hp.Though you didn't ask about it, HP upgrades that significantly boost performance should be accompanies w. other modifications such as improvement to brakes, suspension component upgrades, and w. automatic transmissions, an offboard transmission cooler. Non-forced induction motor upgrades are easier on the engine because they add minimal torque...turbos/superchargers however stress the drivetrain across the entire (rpm) powerband. (Your Honda/Acura tranny if well cared for should manage modest 10-20% increases so long as you don't drive w. a lead foot.)Best of success!