Raceonly Billet Oil Filler Neck 20B Cosmo


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The Raceonly RX7 FD Billet Oil filler neck is designed to eliminate the OEM plastic unit on the 93+ Mazda FD3S RX-7. Designed in-house by the Raceonly team, our Oil Filler supersedes all other Oil Filler options with superior overall design & craftsmanship, Our design provides a chamber specifically designed for oil/air separation which makes it perfect for both street & race and the only of its kind on the market.

The unit is designed to be a BOLT ON replacement of the OEM unit, compatible with Single and Twin Turbo cars. Doesn’t matter what the HP level is or whether you are using a CAST or BILLET block, our filler neck will work for your application. We have supplied two accessories which allows our filler neck to be adapted to the Xcessive Inlet manifold as well as any #BILLET block currently available. We will have an AN-16 adaptor which can be connected to your billet block of choice.

Our unit has Dual AN-6 Ports which gives you options for dual breathers or single, one can be used to recirculate into your intake and the other to your catch can. The options are limitless.

39 in stock (can be backordered)


Key Features

  • Machined from 6061 Billet Aluminium
  • Suits any 20B Cosmo Engine
  • Available in Black, RAW, Purple, Red and Blue
  • Twin AN8 Breather Ports
  • Cast or Billet Blocks
  • What’s Included?

  • Raceonly Billet Oil Filler
  • M6 X20MM Stainless Bolts X2
  • O-ring to seal to your Block to the Oil Filler
  • Additional information

    Weight 3 kg
    Dimensions 30 × 30 × 30 cm