The bad part is, there were quite a few different lq4 maf's and some have different calibrations. Sadly zzp doesn't tell you which theirs is. It looks like you can email them your file and they will change it for you if you're not sure yours is correct.

But I wonder if you're not maxing it out. It really doesn't give much headroom over the stock maf. You should take a scan of a run on your car with hpt and post it.