The b16a is a great platform for generating a lot of hp. Its just tq that the motor struggles with. If you want 400hp from that motor all you need is alot of money and a good tuner somewhere near ya. I would sleeve the motor out to a 1.8l, get lower compression pistons (9.0:1 or so), some aftermarket rods, hondata, aem or some other engine management system, and then get a large turbo set-up, using something like a t3/60-1 or something of the like. With all that you should generate about 400 whp if you get it tuned well. Good luck. By the way all that would run you around $8k or so after tuning, not including the motor or car.