[wash]

What are the differences in valving and spring rate between the b-spec coil over kit and a stock ST?

What did you want to do to improve handling that you couldn't because of NVH, durability or fit issues?

 

[wash]

I think he meant vs a non ST 1.6 Fiesta.

 

[wash]

Since the topic seems to be roll stiffness, what are diameter and wall thickness of the stock and ST twist beam axle tubes?

While you're at it, how about camber and toe specs?

And are there any geometry tricks that would get messed up if the beam was made too stiff?