I thought Whiteline stopped making the 18mm one. I recall TSX having problems with RSB bigger than 20mm (the shearing problem). However, most on the market are 22mm from memory. Not sure about "quality" though, as it's basically a semi-solid bar, and I haven't heard of any of the bars cracking or breaking. The part that breaks was the subframe of the car, as it wasn't designed to handle such high repetitive force.