Any viable experience with air filter housings like these...

[dd74]

I wanted to hear from those who have used both standard Weber watershields and air filter housings like these as to if they've experienced an increase in performance.

Also, when migrating to this type of filter housing from the watershields, whether or not a change in the Webers' jets was made.

Pic. of the filter housings in question below.

Thanks.

[911pcars]

I would guess the improvements can't be felt by a butt dyno; an engine dyno perhaps.

Sherwood

[klaucke]

Also, those may be a bit noiser than water shields. How much depends on other variables like muffler, sound deadening etc, but at WOT they are likely a bit more spirited. Not a big deal but perhaps worth mentioning.