I had have some feedback from the dealers today
The summary of the two so far is as follows:
BMW Performance Kit: R16,300 + Vat
Front and rear springs + Sways and a few minor parts.
AC Schnitzer: R16,100 + Vat
Front and rear springs and Strut Brace, waiting to find if it includes sways
I still have a bit more research to do as I see a few guys with 135’s and 335’s also swop out some of the suspension components with those from the M3, Giving them a little more negative camber up front and decreasing the under steer, as well as stiffer bushings to tighten up the rear.
Cost wise the kits are the same, but if the AC Schnitzer doesn’t have sways then I’ll go with the BMW Performance, as my main goal is not really to lower the car but have more neutral handling and less under steer.