What is the loudest exhaust

[Red Mark]

Fabspeed with valves open is the loudest. With valves closed its within the range of the rest of the market.

Let me correct your statement.
Loudest ... most likely.

Best sounding? Absolutely.

Then let me add one more thing, most present sound, stucco facade shattering peel off deepest base. Yes!!!

Overall, best money ever spent on exhaust (did I mention inexpensive, kinda?)