NITROUS OXIDE ( nos / n2o ) advice forum

Hi.
As I am thinking about a new system for my st and the problems that I had with my old system.
Would by passing the throttle body and going for direct port be suitable?
As I still want no more than 25hp direct port might seem over the top but when the gas goes in the ecu can't change the engine settings to counteract the gas.
If so. How much extra on top of a 150i will a direct port cost. Injector per cylinder. Splitter and pipework.
Many thanks

Direct port systems are always better than single nozzle systems and the details/price of a suitable system can be seen here;

http://www.noswizard.com/car-nitrous-ki ... plete.html