No offense, but maybe you're not tuning for the cai right. Every other tuner, and magazine, has seen a sizable increase in using a CAI over a the stock filter/box. And I'm going to lean towards the dyno sheets I've seen from various tuners, including in person, over one guy I've never heard of who says he does mail order tunes.
My only problem with 1/4 mile claims is that so much of that depends on the driver. You cannot repeat a launch every time so that it is exactly the same. There are way too many variables that will affect your times.
Please post your time slips for each of those 8 passes. Thanks.