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.
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