As Cossie Lee said something is odd with the ST as mine isn't chipped either so shouldn't make anywhere near 270bhp.
They did mine 5 times, I was a nervous wreck
The setup of the rolling road seems to effect the results a hell of a lot as they could get figures for mine ranging from 280BHP to 250BHP.Mine was run by Chris who use to work @ PE doing the work.He's a knowlegable guy on RS's so u can imagine what an Optimistic RR operate could tell u !!!