central 20's a tuning house in japan. Its just a stock ECU with some tweaks to suit your car (might be something as simple as a speed limit removal or fuel cut removal or it could be a whole new fuel map). Anyways, you'll need a full retune if you're goin with those mods to get the most out of them. If its retunable, and you can find someone to do it, use that. Otherwise turf it and get a PFC. Its not worth anymore than a stock ECU... actually might be worth less, coz the only use anyone will have for it is if they have the exact same mods as your car.
http://www.central20.co.jp