Is the flow restriction of the stock ic the inlet or is it the core? If it is the inlet then could you take it to a machine shop and have them replace the small inlet with a larger one.
The owner of a local performance shop says he helped ATR design the w/a IC for syty's. Said they tested a 3" inlet on it instead of 2.5" and it flowed about 1000cfm. So yeah, bigger inlet will help.
I would put the money into an air/air tho...stock IC is a waste for the most part.