Crossflow Radiator

The Flyin' Miata crossflow radiator is engineered to dramatically improve cooling performance for 1990-2005 Miatas. Unlike traditional top-to-bottom flow, this design directs coolant side-to-side through the core, increasing the time spent shedding heat. This version features an updated filler cap placement directly on top of the tank for faster filling and a cleaner installation, especially on MSM models. It also includes an accessible drain for easier maintenance. Koyo's Hypercore increases the effective surface area, enhancing the radiator's ability to shed heat. The core thickness is optimized at 36mm (1.4 inches) to balance heat dissipation with airflow resistance, ensuring superior heat shedding. However, NB models will require new upper mounts (stock lower mounts are reused). Modifications to stock fan shrouding may be necessary if retaining stock fans, and Flyin' Miata recommends their Airflow Kits. This radiator may not fit with all intake systems and does NOT fit with a TDR intercooler on a supercharger. Specific parts are required for NB cars: an upper bracket kit (not needed for NAs) and, if using stock fans, an NB fan bracket kit. A crossflow-specific upper radiator hose is also needed if not using the Flyin' Miata coolant reroute kit. This radiator does not include a built-in transmission cooler, making it incompatible with automatic transmissions without a separate cooler. The radiator is backed by a two-year warranty and is individually leak tested three separate times.