your prob right ty. i cant remember what my truck sounded like stock.

 

Thats cuz you couldnt hear it!!! Them things is so quiet

 

i know when its cold the exhaust brake makes it hissssss

 

Yeah they do. I think they sound cool when they do that

 

i was wonderin the same thing....im wantin to delete the cooler on mine.....the louder the better!!

 

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!

 

yeah but you would lose the exhaust break

 

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

 

bet they sound sweet too, , those 6.7's spool a turbo way fast with what seems like less fuel than a 5.9, there is no replacement for displacement