If I remember correctly, the lime "green tops" are 42's. That is not a CAI, just a hard MAF pipe instead of the hose, and a big K&N on the end of the MAF.
I don't have any HP improvement numbers, but going from a setup like yours to a true cold(er) air setup my IAT temps dropped quite a bit. Air that comes in cooler and doesn't heat sink the intercooler as bad has got to be worth something.
I've thought of that myself. I need to test the cars in race gas. I have driven a car in 93 gas (98 in Finland). At the moment the car did not feel like running correctly. I've been thinking to change the TT 5.7 chip.