any sub frame connector will cause ground clearance issues with side exhaust. It seems like I recall somebody making a set of sfc's that had a notch made into them so the exhaust could tuck up a little higher, but I don't remember who.
I run the bolt-in competition engineering set, but they are welded instead of bolted. I had the exhaust running out of the side temporarily, with the pipes tucked up as high as possible, about an 1/8" away from hitting the sfc's, and only had about 3" of ground clearance, my car is lowered 1" from stock. They would drag on speedbumps and driveways, was not a driveable setup.