Not something I would do, myself. It is small potatoes in return.
I'd want to see back to back dyno tickets before I'd believe that claim too. Just like ecomodding, if it is not properly documented it didn't happen
__________________
2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears