I have the Whiteline on mine. The "propeller" failed on mine this year. This was the fifth season of autocross on it. A weld broke on one of the pivots that the links attach to, the other pivot also has the welds failing. The new part is no better. Going to rebuild the one that failed with a slight design change to get a better weld on it.
I would look at the Cortex, easy to add the torque arm if you want to try that.View attachment 80186
I was placing an order to Cortex for lower trailing arms and decided to bite the bullet and order their watts to replace my Whiteline at same time. Any guesses how many more track days it was going to hold up?? Thank God we’ll never know….Whiteline has stopped selling theirs and I’m assuming this is why. I know I’m on borrowed time with mine - Cortex will be going on before too long.