Don't know about BG but Beck makes a beautiful cross-ram.
However, all my research into sheet metal manifolds for the LSx has been somewhat disappointing. None have matched the Fast in performance for the LS1/2. And that's a non-ported manifold.
The LS7 can be improved with porting, Tony Mamo @ AFR is doing mine this month.
The sheet metals are all heat sinks as opposed to stock.
Several companies and individuals are working on the problem. See LS1tech.com for updates.
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