I want to underline again one thing: It is not that I don't believe you not doing a well calibrated dyno, the numbers are those who seem to be too high for a simple filter change.
If the gains are true, then everyone who's thinking going for a Steeda, FSWerks or K&N intakes are better to change for the K&N filter that will give them a lot more power for 1/3-1/5 of the price. And forget about the exhaust before a tune is out on the market, because adding an exhaust will not make too much of a difference. And maybe this would be right, if someone else would do another dyno with the same setup (K&N filter only, rest is stock) and comes close to these numbers. I ordered a K&N Intake and once I will install it in the car, I'll try to dyno it and post my numbers.
P.S. I stop here anything else because I don't want to argue wether they are good or bad numbers, because it is not my intention. The most important thing is that we love our cars and enjoy them !