you will find there is not much flex between the strut tops in newer cars anyways. if you did feel some difference its probably in your mind. as daz said, most of the bracing and brackets make a few percent difference.

n00b question - How do i fit the brace? Obviously undo the group of nuts on the top of the strut towers fit the brace, then screw it all back on.

Can i do this when the car is on the ground - ie, undo the nuts without any hassles?

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[SIGPIC][/SIGPIC]
Should have bought an STI

Yep can do it on the ground. Its a very simple procedure