Does a front tower brace make a difference?

[Reasoned1]

If it's tight going on, loosen the large screw(s) connecting the bar to it's mounts.

[danewilson77]

So is there a verdict out on which strut tower bar offers the most stiffness?

Most likely something from Mason Engineering or the like is stiffest.

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[Sockethead]

I've been looking for a STB which ties the strut towers to the firewall. I had one on my Mustang. It was reportedly the best design because it triangulated the strut towers with the firewall which acts like a shear plane. I think it's harder to do on the E46 because the cabin air filter is in the way, at a minimum.

The 135 is designed like this. We added a Dinan strut bar to triangulate it...