I miss my Pierce 6 point a lot. I can’t run one due to aero restrictions. Currently I have the TB traction bar and cross member braces and they definitely have more flex than the Pierce 6 point. Their “torque gusset traction bar” appears as if it’ll stiffen up the flex similar to the Pierce but I figured I post and see if anyone has real-world experience with it. Link:
https://tbperformanceproducts.com/products/ford-fiesta-st2014-2019-torque-gusset-traction-bar
https://tbperformanceproducts.com/products/ford-fiesta-st2014-2019-torque-gusset-traction-bar