It was buggin the krap out of me that I couldn't find the SCC article where Shiv calculated the potential HP based on injector size. SO...I found it on RC Engineering's webpage. All the info to calculate is there but to summarize, 440cc injectors will net you approximately 225HP. To get 400HP you would need approximately 790cc injectors
and the 550cc injectors with the VishnuPerformance set-up should net you 280HP. Keep in mind these are all rules of thumb because I think Shiv's car is actually higher than 280HP based on what is being said on this board. Anyways, food for thought.
Here's the link... http://www.rceng.com/technical.htm