The standard Roadster is 30mm higher than the Brabus Roadster so I had to lower the car to improve the handling having changed the wheels and adding spacers which had already widened the track of the car.
I fitted the Bilstin PPS1 Streeline kit which is similar to that of the Brabus but the ride is a little bit harder as the springs are different. As I understand it, the brabus Bilstien suspension never settled and the Streetline kit springs do, so ending up slightly lower than the Standard Brabus.
Something to note is that my pads were 2 and a half years old and they had desintegrated, the pads detached from their backing plates and fell out of the caliper so you may need new pads on the front which cost me £20 as I am waiting for the Brembos to arive, it may be worth changing your discs and pads at the same time.
Make sure you have a trolly jack, at least 1 jack stand and a small siccor jack (found in most cars) which you can use to jack up the hub assembly to line up the bottom bolt with the bottom of the damper to help you get the bolt back through and an E14 torx socket for this centre bolt (random technique helped alot).
For the rear, you need a torx socket set, 16mm socket (x2) or 16mm spanner (x2), to remove the top bolts on the rear damper.
It was simply a case of;
Jacking up the car, jacking point shown below for rear...
...removing the wheels... (avec cat) + remove spacers if you need to, 15mm socket for wheel bolts...
undoing all the top and bottom bolts that hold the damper in place (16mm spanner and adjustable wrench)...
...and then 16 stone of pure... ahegm... muscle standing on the hub to removing the springs watch your fingers here...
Jack up the car and remove the wheel, then remove the two bolts with a torx socket and release the bracket holding the strut to the hub.
The front spring is over the damper (Coilover) on the front and you have to take this apart to re-use the cups on the Streetline Kit. Just take it apart carefully as the spring is under load, then we just pushed the new spring over the damper and hand tightened the nut...
Use the new 22mm nut (supplied with streetline kit) or the 21mm nut and put the dapmer with new spring in situe back on top first, and do up the bolts nice and tight, secondly replacing the long hub bolt with the new one you have hopefully already purchased tighten to 120nm (good idea to use the scissor jack again if you need to to line up the bolts, however it stays in place a bit better on the front and we didn't have to use it for the fronts). Put the wheel back on and tighten the wheel nuts to 118nm, if you dont have a torque wrench buy one.
Do one side at a time and you may need to put a block of wood or brick under the wheel so that when you lower the car you can get the trolley jack out (unless you just lift it up like we did!!)and the car will now be lowered... job done.