Below is my catalog of aftermarket anti-roll bars (also known as ARBs, sway bars, "sways").
The numbers were calculated based on the manufacturer's claims such as "+123% stiffness compared to stock (2013-2016 OEM bar)". Please let me know if you can find more trustworthy numbers! Other contributions to this page are also very much welcome.
Each list is ordered roughly from the softest to stiffest options. All values are provided in lbs/in (shame on me), rounded to the nearest integer.
| Product name | Softest | Stiffest | Notes |
|---|---|---|---|
| Cusco 16 mm (965 311 A16) | 111 | ||
| OEM Gen 1 | 141 | ||
| Perrin 19 mm | 176 | 242 | Might experience fitment issues, such as end links hitting the FLCA at full droop, and/or the tires hitting the ARB at full lock under load |
| ST Suspension 19 mm | 199 | 248 | |
| Karcepts 0.804 in | 235 | 375 | Uses Karcepts end links. Has 5 intermediate positions between the listed rates. |
| Cusco 20 mm (965 311 A20) | 245 | ||
| Karcepts 0.875 in | 299 | 475 | Uses Karcepts end links. Has 5 intermediate positions between the listed rates. |
| Whiteline 20 mm | 306 | 437 | |
| Perrin 22 mm | 324 | 448 | |
| Whiteline 22 mm | 440 | 547 | |
| Eibach 25 mm | 500 | 585 |
| Product name | Softest | Middle | Stiffest | Notes |
|---|---|---|---|---|
| Karcepts 0.095 in | 64 | ... | 109 | Uses Karcepts end links. Has 7 intermediate positions between the listed rates. |
| Karcepts 0.120 in | 71 | ... | 122 | Uses Karcepts end links. Has 7 intermediate positions between the listed rates. |
| Mann Engineering 13 mm | 72 | 89 | 113 | Requires a spacer between the subframe and the bushings, likely won't work on gen2 BRZs |
| Cusco 14 mm (965 311 B14) | 82 | |||
| Karcepts Solid | 84 | ... | 142 | Uses Karcepts end links. Has 7 intermediate positions between the listed rates. |
| OEM 2013-2016 Gen 1 14 mm | 113 | |||
| OEM 2017+ Gen 1 15 mm | 140 | |||
| Perrin 16 mm | 147 | 186 | 244 | Requires Perrin end links for some positions |
| Whiteline 16 mm | 158 | 214 | 312 | |
| Cusco 16 mm (965 311 B16) | 190 | |||
| Whiteline 18 mm | 242 | 314 | 411 | |
| Eibach 19 mm | 255 | 338 | ||
| Perrin 19 mm | 283 | 388 | 505 | |
| Perrin 22 mm | 565 | 718 | 937 |
Psst, it looks like you're into this stuff!
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