Sorry TourDeForce, I wasn't very clear on that. I believe all stock Contour/Mystique 2.5L Y-Pipes are the same part. I'm sure others here know for certain if that's so or not. If not your Ford parts guy can tell you quickly enough.
What I was wondering about is the SHO and MSDS Y-Pipes vs the Ford part.
I was thinking that I'd heard that they had a larger diameter at the outlet, but now that I think about it, that may not be the case as they both plug right into the stock system.
Regards, Alan
