Back to the original question, yes, I do own a GP, and NO, I would not loan it to any tuning company for repeated dyno runs.
Not even BMW, oops, MINI. No way. Development implys that some mods will work well, and improve performance, and some will work poorly and risk engine damage.
It is pretty easy to say "If I owned a GP, I would thrash it, because that is what it is for", if you don't own one.
