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It will improve high speed cornering/stability due to a stiffer chassis and it keep the suspension where it should be. They also look good under the bonnet. I had one on my Evo V
In everyday driving you won't notice a thing! It will help to keep the geometry as it should be in VERY quick road driving or on track days. Be careful re-insurance here - they don't tend to like them as in a front/side impact it may well transfer damage to the other side!
JohnD