i got quoted $70. $240 sounds ridiculous.
tried it myself; ended up paying ford $160 to replace the rear manifold flange bolts when they siezed and left me with a really obnoxious-sounding exhaust leak. never did get the y-pipe installed - traded the car a week later. the straw that broke the camel's back, as it were.
my SVT had about 53k miles on it, and those bolts were solid rust. put my borla on at 37k and didn't really have any problems w/ the cat-flange bolts, but those front ones....yeeouch.
that particular fiasco even cost me a trip to the tail of the dragon w/ the SE-CEG. hmph.
oh well. c'est la vie, especially when modifying cars.