by 
The Curious Bag
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Though technically not part of the suspension itself, both front and rear strut tower brackets (braces) are vital to the handling of many modern cars. These devices perform a number of important functions.
Purpose
Many modern performance cars use both a uni-body (frame-less) construction method and MacPhereson strut suspensions that concentrate the load of both springs and shock absorbers into one small area. Struts braces strengthen this area, which tends to flex under load.
Design
Strut braces are simply bars that run the width of the vehicle and have plates on either end that allow them to be bolted to the top of the strut towers.
Rigidity
Uni-body cars are very light because they lack a frame, but they tend to flex under load. By tying together the strut towers, strut braces can transfer this load and prevent flexing.
Benefits
Rear strut tower braces can make for more precise and predictable handling, and they can also reduce the squeaks and rattles associated with older cars.
Drawbacks
The only real drawback to a rear strut tower brace is that it does occupy a fair amount of space in the trunk, but this is often out-weighed by its benefits.
Source:
Locost7.info: Strut Brace Install
Team-bhp.com: Strut Brace Discussion
Gmpperformance.com: Porsche Strut Tower Brace
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