I've got one of those, and it makes you a track God! Women love you, men admire you, mechanics worship at your feet.

Ok, so it actually removes the speed restriction and slightly advances the ignition.

You have to monkey about with the wiring, as it's designed to fit an HRC loom, not the standard one. I chopped the plugs off, then crimped pins on to match the stock loom, inserted the pins into the loom plug and sealed the whole lot up with silicone - a perfectly valid battle damage repair for aircraft.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
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