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Optional JB4 Harness Extensions: These plug and play connectors simplify the installation and removal of JB4 and other Cadillac piggyback systems. Once installed you can bypass the difficult to reach lower MAP sensor by attaching the two connections to each other. Sold in pairs. What's included (2) Custom Cadillac/GM JB4 MAP sensor bypass extension harnesses Video starts at 3:26 showing the extensions in use.
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🇺🇸 Ship from USA · On Agora since 2026
$59.00