Hmm what could this be?
Yeap! 18mm rear sway bar from whiteline.
About the only perk of stock ride height was that I didn't need to jack the car up to get this in. Having bedded in the new sway, I can comfortably say that it does encourage oversteer, and this is also the thinnest one whiteline offers! Quite happy with the effect given I'm still running an open diff as well.