Direct replacement for your weak factory plastic coolant expansion tank. Made in the USA this all aluminium with beautiful TIG welding. 

Our Coolant Expansion Tank are now endorsed by Mazda Motorsports as a recommended part of the cooling system upgrades for all Spec MX-5 Race Cars!

Constructed with internal baffles and a machined aluminium neck that takes a factory cap. All of the inlets and outlets are positioned to match up with the factory hoses.

The tank mounts to the same location as the factory tank and is built with the same dimensions for an easy fit.

As these cars age, the factory plastic tank is a common failure point because the plastic gets brittle and cracks. Unlike the earlier cars where that just meant a leak, the NC relies on this tank to be a pressurized part of the cooling system, which means that as soon as a crack forms the system loses pressure and the engine overheats.

Good-Win-Racing have had more and more people bring in cars with blown motors due to this simple failure, and along with a new expansion tank now they need a new motor as well, so they decided it was time for a "lifetime" solution. This tank is the solution. It will not fail over time like the factory tank, and looks great as well!

Installation NOTES: While the factory squeeze-clamps on the hoses can be re-used, they get weaker the more they are removed/installed and having a tight seal on all the hoses is important since this tank is pressurized. We recommend changing the squeeze clamps out for worm drive hose clamps .