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A 6.7 IMO will never be super loud compared to a 5.9Lbut I think its the displacement that makes them sound so different and the best mechanical muffler you can have in the vgt turbo
i been hearin alot of ppl talk about doin the 5.9 exhaust manifold and a 5.9 turbo will give you the sound back...its the vgt that makes the quieter..i hadnt tried it yet, but seriously considerin it...seen some vids on youtube of ppl doin that...trucks sound good!
We have 4 customers running 5.9L manifolds and silver 66's and they run hard!!! With the added displacment of the engine the 66 spools almost like stock with the aftermarket turbo tune from H&S