I'm a bit late with this one, but here's my 2 cent (oh yeah, left out the "s"). I ran a single 3" exhaust with a glasspack from Torque Tech (torquetech.com) on my 305 Malibu. The Torque Tech exhaust lined up with the factory exhaust so all I had to do was flange in a cat and cut the aftermarket exhaust to fit. A few years later I ended up doing headers. Had I known the manifolds were cracking, I would have done it all at once. Sounded great though, and people thought I still had the 427 BBC that was in there when I bought the car.
Chickenbone
Chickenbone
