If you want 400whp go turbo.
Have you driven a 400whp car? A lot of people plan out their projects aiming for the highest possible #'s, but for the most part a 225whp JRSC'd car is a blast to drive. A 300whp FWD Integra is a monster. A 350whp turbo Integra delivers so much power you dont even know what to do with it. 400whp+ is just ridiculous for a street car.
But if thats your goals, you can definitely accomplish it with the right parts, but it wont be JRSC'd. If it is, it will take one hefty shot of nitrous to realize those numbers...I cant imagine its been done before.