We followed the procedure put out by "Johnny Bravo" from Audiworld. It was refreshingly easy to do the installation. Take your time and do it right, maybe 1.5 hours as suggested. I think we did the first one in 1 hour and the second in less than 45 minutes.
Side view without the cover on the show how the snorkle blows directly on the filter.
Side view all buttoned up.
I'd have to say I have not tried true performance numbers before/after so I can only base numbers on others experience. It might have an effect on 0-60 times perhaps .1 seconds. You can definitely hear the intake more and there is the sound of rushing air as the turbo begins to really boost.