This is just something that I've been thinking about for a while, obviously the most common strut brace for the 155\Q4 is the Sparco item which is a solid bar. However there are other braces out there for other cars that have a threaded connection in the middle of the car that allows you to bolt the brace down then tension it up.
How much difference do these bars make? Is it a noticeable difference?

Secondly are there any other easily available braces for the 155\Q4 that have the centre adjuster?

This looks like it could become a more pressing issue for me soon as I'm fitting a Kappa inlet to the Q4 and it looks like the standard Sparco item is no longer going to fit.