2001 Mitsubishi Eclipse Spyder Gt Automatic

[Mitsubishiowner]

I have a 2001 Mitsubishi Eclipse Spyder Gt that is an automatic and I've been redoing the whole interior and exterior making the car look good and now it is time for me to move on into the engine. I do not know a lot about engines in cars so it is kind of difficult for me to try and reach my goal of getting around 400hp at the wheel. I don't even know if it is possible for me to reach that amount of hp with a 3.0L V6 but if it is let me know. Also if you have any tips on how to reach this goal let me know (even options up to doing an engine swap). Thank you