Been noticing a loud hissing sound at he engine compartment, coming from behind the engine, towards the firewall. A close inspection discovered that there’s a tear on the air filter box seal. The fix is very simple, just use some 3M double side tape to secure the loose foam seal.
Check out the red colour 3M double sided tape, with the protector yet to be removed.
Discovered this while cleaning my K&N air filter, cleaned my throttle at the same time.