Without head to head testing there is no accurate way to say how much stiffer any swaybar is from OEM and from other aftermarket swaybars.
The diameter of the bar is a rough indicator, the thicker the bar the stiffer it usually is, hollow bars are lighter in weight and usually is found in a thicker rear bar vs the solid 16mm rear bar. The more holes the finer the adjustments possible and a combination of hole settings can be used such as with a 3 hole using the middle setting on one side and softest setting on the other side, adjustable links usually assist with fitment.
Rear OEM swaybar links are very thin and not stiff, under heavy track use they are known to fail, front OEM links are very short and stiff but with aftermarket bars adjustble front links help with fitment.
Front bar 34mm Estimated stiffness about 800-900 lbs/in.
Rear bar 14mm
Whiteline swaybars for GTR
Front bar 2-way adjustable 33mm
Rear bar 3-way adjustable 20mm, (earlier there was an 18mm rear bar with 3 holes but it is not available currently).
Full set comes with front and rear swaybar links, otherwise single bars don't include links
Eibach swaybars for GTR
Front bar Tubular 2-way adjustable 35mm
Rear bar Tubular 5-way adjustable 16mm
For comparison Stillen set of swaybars
• 3-Way Adjustable Front Bar – 20-38% Stiffer, Estimated stiffness 1100 lbs./in. or about 33% stiffer
• 5-Way Adjustable Rear Bar – 67-108% Stiffer
• Adjustable Sway-Bar End Links
Front bars is about 12% Stiffer in the front , 34 mm in diameter, weigh in at 14.6 lbs and are hollow.
Rear bar is a 3 way adjustable 16 mm diameter, 5.5 lb solid bar. Rates of adjustment are 0% , 13%, and 16% stiffer than stock.
Forged Performance bars (no longer available for sale)
Front bar 38.3mm, estimated stiffness 1800 lbs./in. or 100% stiffer
Rear bar 24mm, (claimed 800% stiffer)
For info on Forged swaybars see post below from past
Edited by AutoXGTR, 16 March 2021 - 05:49 PM.