I haven't got one but i did do the summernats this year at imcc and came 5th. But you want to have some soft springs and drop your rear roll center to the lowest setting as it wil;l give you moore rear grip off power. And also shorten your wheelbase.

So hopefully that may work for you but everyone has different driving styles.

Im doing a set up sheet for it now you can find it on the xray website.

Under Joel Casey. : Summernats 2011