Raceonly 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.

Out of stock

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 aluminum, precision machined & beautifully TIG welded.
  • 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.
  • Compact design allows added clearance for large turbochargers & aggressive turbo placement.
  • 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.