to answer the first question, its free for me , my boss is a engine builder/dyno tuner so when it fits in with the shedual i can put my car up on the dyno at any time.
best so far is 93rwhp out of the A15 with a 63 series 5 speed and h165 diff, averaged at 91rwhp.
but for the public its around about 140 an hour. but ABSOLUTLY everything is done whilst its on the dyno, no stuffing round. esspecially not at that price