You could also take a dremel to the air box like Deezler did in his Build thread.
http://ecomodder.com/forum/showthrea...html#post99025
Anything you can do to to increase air pressure in the inlet of the turbo will be an improvement. I once calculated how much more power my ram air intake on my Mercedes gives me. I came up with about 1/3 of a HP at 70 mph.