Sway Bars or Anti Roll Bars

Recently I have been in a few discussions involving sway bar combos. One should know that it's always not necessarily the best solution to run giant sway bars. There is a lot to consider such as tire sizes, width combos, suspension stiffness, and general driving characteristics. Another thing to consider is the price, such as using a combo using an array of OEM bars vs aftermarket. Also, another thing to make sure to check is the condition of bushings for the bar as well as the end-links and proper torque. Recently Eibach has released some sway bars for a great price, and some other brands have developed bars with adjustable end-links so you can really dial in your liking. If you didn't already know a sway bar connects one side of the suspension to the other and sends force from one side to another, the larger the bar, the stiffer the roll will be in a turn making it more difficult for the tire to roll over on its contact path. Changing this will affect over and understeer conditions. Ill try to update this as the thread grows or I find more.

The List (From S2KI The Great Sway Bar Thread http://www.s2ki.com/s2000/topic/351694-the-great-swaybar-thread/page__hl__sway+bar+sizes)


OEM Sway Bars
AP1 2000-2001
F: 28.2x5.0mm (P/N: 51300-S2A-003)
R: 27.2x5.3mm (P/N: 52300-S2A-013)

AP1 2002-2003
F: 26.5x4.5mm (P/N: 51300-S2A-013)
R: 27.2x4.5mm (P/N: 52300-S2A-J01)

AP2 2004-2007
F: 26.5x4.5mm (P/N: 51300-S2A-023)
R: 25.4x4.5mm (P/N: 52300-S2A-J02)


AP2 2008-
F: 27.2mm 
R: 25.4mm 


AP2 CR
F: 28.6mm
R: 26.5mm

Aftermarket
Alex
F: 32.0mm
R: 24.5mm
R: 30.0mm
ASM:
F: 25.4x4.0mm
F: 31.8x3.7mm
R: 25.4x3.0mm
R: 30.2x3.5mm
Comptech:
F: 31.75mm
R: 31.75mm
Cusco:
F: 32mm
R: 30mm
Gendron:
F: 31.75x4.76mm
F:31.75x6.35mm
F: 31.75mm
Mugen:
F: 25.4mm
F: 31.8mm
R: 25.4mm
R: 30.0mm
Saner:
F: 31.75mm 3 position adjustable
Spoon:
F: 27x4.8mm
R: 27x4.3mm
SWIFT:
F: 87% stiffer
R: 116% stiffer
*compared to Early AP1 ('00-'01)
Tanabe:
F: 30.4mm
R: 30.4mm
Whiteline:
F: 30.0mm 
R: 30mm
STsuspensions
F: 28.2mm
R: 27.2mm 
Eibach
F: 32mm
R: 29mm




Stole this photo from MAXREV, But he also has a nice thread here and a review of the Eibach http://www.s2ki.com/s2000/topic/822700-eibach-sway-bars-review/