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I'm not saying you're bragging etc... It seems we're all too fixated on numbers. On a dyno all you need is a pin straight A/F so you know you're making max power. That's what counts.
Don't forget. We don't race on dyno meters we race at tracks or the street.. For instance gears will not help ( if not hurt) dyno numbers but make your car faster, I try to explain this to people all the time when this comes up.. Driveshaft upgrade as well. Dyno's are for tuneing purposes only not to see who has the biggest whatever. And also IF it was a cooler day your numbers would rise! AND all dyno's run different.. Don't be upset, your car is fast!
my car dynod 30hp more on 3.31 gears than it did on 3.73 gears. But at the track the 3.73 gears were almost .5 seconds faster. As stated above dyno's are for tuning purposes only. Track it, see what MPH you are running and that will be your best test.
Was it a 5th gear pull? Mine did 389 stock... and then again.. 389 a year later with the FRPP tune.. so at least you had gain. The only thing I gained with the FRPP tune was detonation.