FYI, the magnaflow description is misleading.
The 3" size listed is the 4 bolt flange inlet size, all the piping after the split is 2.5".
If you search for magnaflow there should be some threads pop up as I know it's been talked about.
If you're looking for a real 3" exhaust check out the GN1 304 polished SS system, the RJC Racing crossflow 304 polished SS system or the Pypes 409 SS system.