From a post I made on this subject in anther section:
...I was at the Roush building on Friday morning getting their stage 3 suspension kit installed on my plain jane '06 Mustang GT, but that's the subject of another post.
While there, the rep took me for a 15 minute ride in the 540RH. All I can say is WHOOO HOOO. What a rush...or is that Roush?:-) The rep said it was rated at 540 hp at the crank but it was actually more like 575. All I know is that I've never been pinned back in my seat like that before.
Here's a pic taken outside there front door with a convertible 427R and the silver 540RH
2010 540RH and 427R on Flickr - Photo Sharing!