What kind of dyno, mustang dyno or dyno jet? Mustang dyno are typically refered to as heartbreakers because of lower number (they also allow for the shop to mess with calibrations a lot more).
Still not bad for a stock-like build at the wheels, though IDK what the 05-10 4.6 is rated for at the crank.
I'd like to know the SAE correction factor used as well.
Also, if dynojet was used, you can ask for the dyno run files, if the shop will give you them, and you can download WinPEP7 and open them up at home/use them to overlay runs if you change anything in the future.
2003 Redfire & Black V6. Full suspension, 8.8 w/ 4.10s, tuned. 4.3L stroker + turbo capable of 550 hp soon
DD: 2015 SHO PP, 12.87 @107 1/4 mile (1.8 60') on 93 octane tune/CAI only. SAE corrected: 369.4/451.4 on E20, full Bolt On