The ESS claims are from a forum post by ESS, which has now been added for reference. Note they state crank horse power not wheel.
http://f80.bimmerpost.com/forums/sho....php?t=1046287
Same story for DINAN, they have a chart with the deltas.
http://f80.bimmerpost.com/forums/sho....php?t=1036115
I would take the advertised gains with a grain of salt. Independent dynos have been conducted on some of them in the sheet.