A great factual post this, especially the informed comment from 'Spinksy', who has obviously never seen either kit, but is quite adamant that there is a 50rwkw - 100rwkw difference between them. Well Spinksy, you are wrong.
One of the features of the show was a direct shootout between the Vortech XR8 and the Starr Autorotor Monaro. Run on the same dyno, within 15 minutes of each other, the XR8 made a best figure of 346rwkw, and the Monaro 349rwkw.
Make of that what you will. However, this is fact, not teenage rambling