Very nice adjustable springs... but a little expensive when your target is just trackdays.
We use 2 cheap ways to make the front suspensions stiffer, first is very cheap and very efficient but not ajustable.
1) Buy 2 springs 10 euros each one !
Photos shows Bilstein but it works 10 time better with Koni :
![Image](http://i44.servimg.com/u/f44/16/54/85/98/image_73.jpg)
Many choice there
http://www.geiss.fr/fr/produits/documents/RESSORTS.pdf
I have CXF4-089 321 N/mm
You need 2 parts machined which will do "guide" for springs
![Image](http://i44.servimg.com/u/f44/16/54/85/98/2012-057.jpg)
This one is usefull to but do nothing when braking,
![Image](http://i34.servimg.com/u/f34/16/14/04/79/img_1010.jpg)
Little and cheap springs do the same work than the RSR BAR even when you are braking
And the second way is....
Later thank you