Easy way to find out what's wrong... swap your stock intake back in and do the run again.
We've found that you can lose power with poor CAI fitment... anything that messes with the airflow around the MAF is bad for power (up to 5 hp on the dyno, given the same airfilter, depending on pipe shape and filter placement)
Otherwise, it's time to start checking your sensors. A crank position sensor or cam position sensor problem, for example, will not manifest in regular driving, but will show up as a 7-10 hp drop on the dyno.