Dyno's are a good tuning tool. You really can't compare one dyno reading to someone else's dyno sheet.
The calibration could have been off.
I have a car with DR lay down 10 hp less and when he swapped back to street tires pick up those "missing" horses.
Post up the sheet.
2016 VW GTI 2.0 Turbo
1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph