mclaren don't make engines, so why would they have an engine dyno? mercedes high performance powertrains in brixworth do however. my ex boss works there in the test department, but i highly doubt that they have the time or inclination to piss about with an old transit engine during the season of the biggest technical changes in a long time.

i once remapped someone's vw at that MPE place, but don't have his contact details anymore otherwise i'd pass them on.