Touch wood I only blew one car up on my dyno!!!!!
I think the fact of me adding around a 5000hp shot of NOS direct into the throttle body helped towards all 4 pistons, valves and spark plugs.... but not to worry guys it was only a 100hp scrap Rover 25.
(the NOS made 100bhp gain 120lbft@1800rpm gain before the engine melted after 4 second)
Nick