I've had this since April 2017 and I'm in love with it! This combined with the ECU flash from 2WDW is an amazing combo.
I'm currently running this without the baffle and it sounds wicked. Noise level isn't obnoxious either.
Build quality - Damn good. I'm so glad this came as a full exhaust system. No cutting and welding. A much cleaner look and the header section has colorized quite nicely. It is so much lighter than the stock exhaust and is pretty resistant to rock chips and such. No air leaks at the connection sections as long as you use the sealant paste included with the exhaust.
Longevity - Everything feels and sounds solid. No rattles or any suspicious sounds from any parts of the exhaust. Pretty simple to wipe down after rides (after everything has cooled down).
Looks - This is 100% my opinion: I think this exhaust looks the best for the overall FZ-07 design. The blue tip at the end, the size, the carb fiber section, everything.
Final verdict - Glad I bought it over other options. Would be again if I got another FZ-07 and would buy from Black Widow for any other future bikes I get.
When you add a small orifice into a long rubber hose, you effectively are creating an expansion can within the hose itself - just on a smaller scale. Been doin carb and throttle body syncs this way since the 70s.
The Morgan Carbtune actually includes plugs that have a small orifice to place inside the hoses - note the word "restrictors" in the description https://www.carbtune.com