just the usual surface rust in spots, like flanges... nothing serious. (removed the heatwrap to check this) The exhaust has some kind of coating to prevent rust http://www.blitz-uk.co.uk/Product-12.aspx
I cant imagine this stiffens up the chassis much. There is such a distance between the mounting point and tube that surely the flat bar will flex a lot???
free bump, Despite being genuine i don`t think people want to fork out the extra money for it which is a shame. I remember i paid €250 for a fake which was one of ep-stylings first spoilers and fitment was excellent back in 09