BMW OEM Fuel Injectors N54 N63 INDEX 12 135 335 535 550 650 7585261-12 set

BMW N54 Index 12 Fuel Injector – Genuine Bosch High-Precision Injector for 135i, 335i, 535i, and Z4 35i

Upgrade your BMW’s performance and reliability with the latest Index 12 fuel injector—the most refined and reliable version ever released for the legendary N54 twin-turbo inline-six engine. Whether you’re maintaining a daily driver, building a high-boost street monster, or just replacing a misfiring injector, Index 12 is the gold standard trusted by performance shops, tuners, and BMW enthusiasts worldwide.

This OEM Bosch Index 12 injector is engineered for optimal fuel delivery, cold start reliability, and long-term durability. It features improved internal materials, better sealing, and the most precise spray pattern of any previous index. That means better combustion, more consistent AFRs, smoother idling, fewer misfires, and peak performance under high boost.

Older injectors (Index 1–11) are known to suffer from leaking, poor atomization, injector rattle, and rough cold starts. Replacing your old or mismatched injectors with a full set of Index 12 injectors ensures your N54 runs like it should—whether you're stock, FBO, or pushing upgraded turbos.

These injectors are a direct fit for all BMWs equipped with the N54 engine, including:

• BMW 135i (2007–2010)

• BMW 335i (2007–2010)

• BMW 335xi & 335i xDrive (E90/E92)

• BMW 535i (E60)

• BMW Z4 35i & 35is (E89)

• BMW 1M Coupe

Each injector is brand new, Index 12 stamped, and comes pre-installed with the required decoupling ring and teflon seal for proper fitment. We recommend replacing injectors as a full set or having them coded via INPA or ISTA for proper ECU calibration.

Why Choose Index 12 Injectors?
✅ OEM Bosch Quality – Not cheap aftermarket knockoffs
✅ Latest revision with all updated internals
✅ Improved fuel economy, smoother idle, better throttle response
✅ Required for tuning and high horsepower builds
✅ Trusted by top BMW tuners and shops
✅ Backed by warranty

Don’t risk your build or waste time chasing misfires and cold start problems. Get the most reliable and up-to-date fuel injector available for your N54 and restore the power, consistency, and efficiency your engine was designed to deliver.