The NRW-Design Billet Aluminum Spark Plug Tubes are a premium upgrade for aging or damaged spark plug tubes on BMWs S65 and S85 engines. Designed to permanently resolve oil intrusion into the spark plug wellsa common issue with OEM plastic tubesthese CNC-machined aluminum replacements deliver unmatched durability, perfect fitment, and long-term reliability.

Each tube is machined from solid 6061-T6 aluminum and anodized for corrosion resistance. Unlike plastic factory units that can deform, crack, or loosen over time, NRWs billet solution ensures a consistent seal and a secure hold, even in high-heat environments and motorsport applications.

Product Details

• Fits BMW E9X M3 (S65 V8) and E6X M5 / M6 (S85 V10)
• Direct replacement for OEM spark plug tubes
• CNC-machined from 6061-T6 billet aluminum
• Anodized finish for heat and corrosion resistance
• Prevents oil seepage into spark plug wells
• Compatible with OEM and NRW valve cover gaskets
• Made in the USA by NRW Design
• Sold as a complete set
  • x8 for S65
  • x10 for S85