The biggest impact the arms have by replacing them are the type of bushing material they use. OEM (Stock) use rubber. Rubber is great for reducing NVH and a comfy cushy ride but it also leads to a lot of slop like AMDan said.
Polyurethane bushings have long been used to reduce that bounciness but at the cost of increasing NVH and making things a bit rougher. To the performance enthusiast this is normally a minimal negative to what is otherwise a significant positive (better handling).
For better corning ability (and depending on your budget) you should really look at a Watts Link system.
08 S197 GT Auto: FRPP Strut Tower Brace, FRPP Bullitt CAI, Bama 91-P Tune
Pending upgrades: Shaftmasters Aluminum 3.5" DS, FRPP 3.73 gears, Axle back exahust (?)
Originally Posted by LostBoyz
if you are getting 29mpg in your 5.0, you aren't driving it correctly