www.phearable.net

they sell chipped ECUs with basemaps and the works, and they are already tuned to a setup that will be similar to yours. this way when you go to get it tuned, it will be MUCH easier to tune it, and if you decide not to get it tuned (which i strongly suggest you do, but not everyone does) it makes it alot more safe to drive with less worry.

go to that site, and contact them, explain your situation, and they'll tell you EVERYTHING you need to know and get you hooked up with a p28.