back in the day "Chipped to F#*k" was a term used to indicate
your RS or whatever was souped up abit.
if there is no proof its been to Newcastle under Lyme for a bit of
souping ie bill or recipt, i would take it lightly.
the differance between a standard one and 280 hp is bigger than
280 ish to 320 ish, some people can't tell what 340 0r 350 feels like,
or they confuse a 270 ish car with a 350 ish one
it could also need just a good tune up which may get it feeling
souped up again.
i have had RS'S which when tuned fell like a differant car