Wont go into too much detail, but customer came in with a supposed boost leak. Did a boost leak test and came back clean. did a dyno pull and verified it is pegging 10psi and holding strong. but barely making 400whp/tq. any help would be great. To me the MAF readings seem low for a twin turbo setup at 10psi. but both boost gauge and boost leak test verify it is holding all the boost.
2016 stock mustang GT 6M
hellion TT 6266 setup
ID1000s
e85
walbro 450lph pump
10psi
thanks in advance