I recommend Bosal for two reasons.
AND, while I have the FocusSport, I had to bore the holes in the flanges a bit wider to get the bolts to line up straight w/ the cat and the rest of the exhaust. The FS piece was originally designed w/ their "Race-Header" in mind. The bolts are closer to the piping than the stock cat, or most other aftermarket designs.
The FS piece is good, but I'd say save the work.
Perhaps in our first flexpipes released some did not match up with certain other parts, but since then all our flex pipes are made to fit the factory components or our own with no modifications needed at all for proper fitting.