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BMW fuel system kits provide a comprehensive solution for maintaining and upgrading the fuel delivery system, ensuring optimal engine performance and efficiency. Over time, fuel pumps, injectors, filters, and pressure regulators can wear out, leading to poor fuel economy, hard starts, misfires, and engine hesitation. Common problems include clogged fuel injectors, failing fuel pumps, and fuel pressure inconsistencies, which can result in rough idling and reduced power. Upgrading or replacing worn components with a complete BMW fuel system kit restores proper fuel flow, enhances throttle response, and improves overall drivability. Our selection of OEM and high-performance BMW fuel system kits includes everything needed for a reliable fuel system refresh, ensuring a precise fit and long-lasting durability for a wide range of BMW models.

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JB4PRO Flex Fuel Add On Harness - B58/S58

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:49822568

Part#: JB4PB58FFAOH

Ships on Nov 13, 2026

$ 49.00 USD

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$ 49.00 USD

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Take your B58 or S58 build further with the JB4PRO Flex Fuel Add-On Harness—a simple, plug-and-play way to add an ethanol sensor and optional fuel pressure sensor to your JB4PRO setup. Keep your install clean, your wiring organized, and your tune dialed to match every fuel blend in the tank. Why it matters: Plug & Play: Connects directly to your JB4PRO—no cutting or splicing required. Sensor Ready: Supports ethanol and fuel pressure sensors for precise, real-time fueling adjustments. Clean, Safe Installation: Includes a 12 V adapter and inline fuse for hassle-free integration. How it works: This harness links your JB4PRO tuner to your flex fuel hardware. It’s not a complete flex fuel kit—you still need a compatible ethanol sensor—but it gives your JB4PRO the accurate readings it needs to adjust timing, boost, and fueling for E30, E50, or E85 blends.

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BMS Gen 1 B58 BMW Aluminum Port Injection Manifold

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:27171924

Part#: BMSB58G1-PRM

Ships in 8 Business Days

Starting at $ 3,158.00 USD

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Starting at $ 3,158.00 USD

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Add more fuel via port Injection while increasing airflow in your Gen 1 B58 Powered BMW When it comes to intake manifolds it doesn't get any better than this. The Burger Motorsports intake manifold replaces your weak factory plastic B58 manifold with a direct fit high flow high strength aluminum manifold. Features port injection bungs located on the top of the manifold for easy access and optimal injector spray pattern, and 1/8" expansion vacuum ports perfect for gauges, BOV references, or Hobbs switches. Includes high-quality o-rings and all required hardware. Your factory high-quality intercooler core slides right in. Available with required port injection hardware (calibrated injectors with plug-and-play fuel line), or ala-cart without the extra fueling hardware. The optional high-quality Bosch EV14 42mm fuel injectors are offered in 550cc, 750cc, and 950cc options. For most 700-800whp applications we suggest the 750cc injectors, while the 550cc injectors are suitable for applications below 700whp. This kit includes a FREE $99.00 Burger Motorsports B58 Phenolic Thermal Intake Manifold Spacer FEATURES AND BENEFITS Increased flow Integrated top mount port injection bungs Much stronger than stock Looks amazing under the hood Lightweight aluminum construction All factory connections Extra ports for a BOV, Hobb's switch, or boost gauge Includes upgraded high-temperature o-rings Optional Motiv Reflex + Injector Controller Optional Injector Block Off Plugs Optional Deasthwerks 1000cc Injectors

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