just surfing and noticed this, anybody used one?

http://www.motorcycle-exhausts.co.uk...oducts_id=9440


For maximum engine protection, this Insert TCI-Y6E08-S1 is designed to be used in conjunction with the Stage 2 Air Box Cover TC-Y6E08-S2 and Filter Element R-Y6E08-01 to restrict air flow to safe linits when a Power Commander or similar fuel injecion controller is not used.
Using the DNA Stage 2 cover without fitting this Insert or modifying the fuel injection is not recommended and can cause damage to the engine.