"Rick, the Mazda6S precats are unlike the taurus and the contour. The precats :
Use a end flange instead of a ball-swivel; have differently located emissions fittings; and being engineered by Ford--the tubes are even smaller for this 3.0 than found on the earlies 2.5 !"
Here's a copy of what I got. I guess it doesn't mean that it won't fit at all, but at a minimum would take some additional work and a y-pipe that fit these headers in lieu of a contour one.
Rick
