something is definitely off, especially being on a mustang dyno since those tend to read lower than dynojets. Numbers don't mean a lot though, just make sure u use the same dyno to measure gains from mods.
2015 MW/SO M4 M-DCT [CURRENT]
2011 AW/CR 335is DCT FBO [SOLD]
2008 AW/CR 335i 6MT FBO [SOLD]