I cut the back of the lid off. Just ran a hacksaw down the lip where the two tubes meet the box proper, then accross to the back. Makes for a nice huge hole. I also removed the web from the lid, though I don't know if that makes any difference.

I think it makes a great noise, and still keeps the intake roughly where Honda made it.

Bike made 62hp when it was properly setup...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball