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I have noticed the CF liners don't really do much but allow you to loose the o-rings from your barrel set up. For me accuracy wise it's pretty hard to pin down much if any change from the stock system which was already shooting lights out. Still I expect they can help a bit depending on your gun, caliber and tune.

From what I have read the 700mm carbon shrouded harmonic tuner makes the gun too long to fit into the case. They are also very hard to find in stock. 

It looks like Palm Beach has the detachable unit in stock and at a good price as well.

https://palmbeachairguns.com/product/fx-harmonic-tuner/



EDIT;

Shows on backorder now so I Guess I should say had. Said "in stock" when I ordered mine. Looks like all they have now is a 600mm full shrouded unit.

Impacts may not fit in the case.


 
My Maverick sniper with 700mm barrel fits in the case with the tuner shroud and DonnyFL sumo installed
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