Swift USA and SP Engineering have been working together on a Sway bar upgrade for the R35 GT-R. The new bars are 12 % larger at the front , 34 mm in diameter, weigh in at 14.6 lbs and are hollow. At the rear the bar is a 3 way adjustable 16 mm diameter, 5.5 lb solid bar. The rates of adjustment are 0% , 13%, and 16% stiffer than stock.
The sway bars and Swift Springs are in stock at SP Engineering now. Source : Nagtroc.