The stiffer the bar, the more force required to move the left and right wheels relative to each other. This increases the amount of force required to make the body roll.
The item "Whiteline BSR36XXZ Subaru Impreza 03-07 Rear Anti-Roll Bar 27mm XX adjustable" is in sale since Friday, November 10, 2017. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Performance Suspension\Performance Sway Bars". The seller is "monster_motorsport" and is located in Loughborough. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Canada, Brazil, Japan, New Zealand, Hong Kong, Norway, Indonesia, Malaysia, Mexico, Singapore, South Korea, Switzerland, Taiwan, Thailand, Chile.