Don't know about the XY Lee re HP.
I know this Genuine GT run 10.51@129.98mph through a 4 spd on its first and only pass as it wasn't fitted with a cage and was asked to leave.
Full weight car incl AC, Sunroof and PS was functional during the pass lol. Thought it was tough and sorry for off topic.
http://cacklingpipes.com/081010_wsid...y01008_133.JPG