The b18c motor can accept a pretty good number of boost and make a lot of power. My idea would be to get a rev hard turbo. But, if money is a problem, a custom turbo kit made by you would work well also.ignent bastad said:
What you should look for is a good manifold. In your case, im guessing there isn't much room in front of the block (between radiator and motor) to hold a nice equal length manifold etc. So make sure that if you get a kit, it will fit your car. If it won't, custom will work just fine.
good luck, any more questions, just PM me