Always made using only virgin billet aluminum, a handsome anodized finish, and the tightest tolerances; our pulleys are used on some of the fastest BMWs on the planet.
Our very lightweight design optimizes performance and response while under-driving components just the right amount for proper function at all RPMs.
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| Replaces BMW Bosch part number | 12 31 1 432 988 |
| Replaces BMW Valeo part number | 12 31 1 713 945 |
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