Seriously, if that cars numbers truly represent what’s expected with that head work it is likely damn well worth it. If that’s the case I’m sure that one healthy fun ride on the track.I can tell you this, if P/P is good for 40 rwhp on 93, I'm'a think long and hard about sending mine off to have them done.
STD correction still corrects for temp, pressure and humidity. It just corrects to a higher baro and reads about 2% higher than SAE correction. You might be mistaken for uncorrected dyno readings in which no correction factor is applied and will vary widely based on D/A.
Correction Factor Temperature Station Pressure Humidity
J607 60° F 29.92 inHg 0%
J1349 (SAE) 77° F 29.234 inHg 0%
STD 77° F 29.92 inHg 0%