This was the post Adam linked to:
"You can also use these if you have the ESA fitted. Just remove the MASSIVE originals and fit these. It does away with the shocking electronic suspension and gives you an amazing ride...
And yup that's exactly what I did to mine, and it doesn't throw up any warning lights either, when you remove the ESA.
About the best mod you can do to the GSA!!! Easily as good as Ohlins!!"