Raceonly Billet AST Delete kit for FD3S RX7


The Raceonly Expansion Tank is designed to eliminate the OEM & other aftermarket AST (air separator tank) on the 93+ Mazda FD3S RX-7. Designed in-house by the Raceonly team, our expansion tank supersedes all other remote mount AST layouts with superior overall design & craftsmanship. More efficient coolant/water transfer & air separation makes it perfect for both street & race, as well as less headaches and failure points. See full features.

21 in stock (can be backordered)

Ast Kit Delete

Key Features

  • Made in Australia.
  • Replaces both the factory thermostat housing/water neck & the air separator tank.
  • Made entirely of aircraft grade billet 6061 aluminum, precision machined
  • Simple, 100% direct bolt-on.
  • Works w/ the factory metric thread water level sensor, overflow tank, large & the small radiator hoses & factory AST cap.
  • Reduces unnecessary weight & eliminates all the extra small hose nonsense.
  • No longer have to worry about the Plastic AST bottle exploding and destroying your engine.
  • Compact design allows added clearance for large turbochargers & aggressive turbo placement.
  • Compatible with Sequential Twin turbo FD and Single Turbo FD RX7.
  • Fits all FD RX7’s from 93-2002
  • Works with large water pump underdrive & idler pulleys.
  • Black powder coated finish
  • Increased water transfer & air separation.
  • Durable, lightweight, & built to last. 3 year warranty covers both materials & craftsmanship.

What’s Included?

  • M6X20Mm Stainless Bolts X3
  • Dash 6 ORB Male AN Adaptor
  • 9o Degree Push Lock 3/8 Barb Fitting
  • Spring Clamp for Overflow Bottle Hose

Additional information

Weight 3 kg
Dimensions 30 × 30 × 30 cm