In an effort to change this, I picked up a set of LS7 Z06 exhaust manifolds and downpipes. The design of the Z06 manifold is equal length with a central collector. Unfortunately, the entire exhaust has to be re-fabricated to fit the Z06 manifolds. Sometime in the future, these manifolds will be installed.
LS1 F-Body Manifold
LS7 Manifolds & Downpipes