Well if you must, go with local support as setting up a race car is not like setting up your road / track day car.
There is a BLACK ART to this and unless you race a car offen you have no hope of getting the setup correct.
These top line systems will not work correctly if you havent done the soild subframe bushes, adjustable arms and sway bars etc. And dont forget the semi slick tyres.
If you dont do all this you are wasting you $$$$$$$$$$$$ and by the way it will drive like a brick on the road duck and dive all over the place.
But on the track what a dream total fun but dont forget that the little BIMMER
cant do more than 5 hot laps on a cold day. but thats another story
So why do you need the best shocks ?