i recently swapped my 5.4 08 triton ofc and want to know whats the loudest best sound intake i can get?

 

Two things come to mind
These are older than you and I put together
"If it don't run, chrome it"
and
"Sounds bad, does it run"
Not a fan of cold air intakes
Keep it factory if you know what's good for you
That said and rant over, get one with an air filter that does not need to be oiled
BTW your factory box has a fresh air intake, and the water intrusion part is the most important

 

epic.