You know, a little bit of negative camber goes a much longer way than any strut brace will ever do for this car. Knock out the alignment pin and push the struts in toward the engine as far as it goes and the car will "handle" like stink. Stink as in "good".
The E85/E86 chassis is stiff enough and it comes with two cross brace bolted to the chassis bulk head. Now, I'm no structural engineer, but as far as I know, braces bolted to the bulk head is much more effective than a piece of metal tying down two strut towers ALREADY BRACED by the bolted brace. Even on the relative "soft" E46 chassis, I put on the E46 M3 strut tower brace and it made little next to no difference in the car's handling characteristics, both on the street and on the track.
A little comment on RussRam's picture on the ring...What body roll?
