RX7 AST Delete Coolant Expansion Tank Single Turbo

RX7 AST Delete Coolant Expansion Tank Single Turbo



RX7 AST Delete Coolant Expansion Tank Single Turbo


TGS Tunings RX7 AST Delete Coolant Expansion Tank Single Turbo variant is the ideal choice to eliminate the OEM & other aftermarket AST (air separator tank) on the 93+ Mazda FD RX-7.

  • Made In The UK
  • Single Turbo only will not fit the Twin Turbo
  • Replaces both the factory thermostat housing/water neck & the air separator tank AST
  • Billet aluminium filler neck, precision machined & beautifully TIG welded.
  • Simple, 100% direct bolt-on complete with mounting bolts.
  • Works with the factory metric thread water level sensor and factory AST cap.
  • Compact design allows added clearance for large turbochargers.
  • Increased water transfer & air separation.
  • All products are Pressure tested before shipping.
  • 38mm bead rolled coolant pipe inlet
  • Made on order, Orders take around 48hrs to ship out
  • Worldwide Shipping Via Fedex


The tank has been tested and works with the DM Motorsports Underdrive water pump pulleys and maybe other makes.


These tanks are hand fabricated right here in our workshop based in Stockport, Greater Manchester. Years of experience in modifying and tuning these legendary RX7s has given us the edge over the competition. Each tank is built and tested to make sure it meets our high standards.

This part is made to order lead times 4-10 days ,

Additional information

Weight 2 kg
Dimensions 30 × 23 × 11 cm

Brushed, Polished

Overflow Placement

Backward Facing, Forward Facing


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