It sort of hard to tell what gains you would get each car is different. But I have to ask why would you go with a ported turbo at this time? People have ran their stock air intake systems on ported turbo's. There's only a little gain of having a aftermarket intake but not much.

For more information go to SRTforums.com there's people there with ported turbo's and so fourth. Everyone has different setups hence why its hard to give you any numbers. The only way you can tell for yourself is by dynoing your car as it sits right now and dynoing it after a ported turbo and intake system.

I don't quite understand what you mean by "new fuel map".