Koyo Rad N-FLO Dual Pass HH Core Racing Radiator: 89-91 S5 Mazda RX-7

*Features*
* Koyorad Japan “HH” Series 48mm Hyper Core (N-Flo Dual Pass)
* OE Specific mounting and direct fit
* Nocolok-R Brazing
* Precise Tube and Fin alignment
* Billet aluminum filler neck
* 1/8” NPT female accessory fitting
* Fitment is specific to FC Series 5 chassis. Must use OEM Series 5 side brackets. (Series 4 brackets are different). Retains use of top coolant level sensor provision.

Direct bolt-on Mazda 89-91 S5 FC3S RX-7 Koyo Rad HH Series N-Flo racing radiator with dual pass N-Flow design. The N-Flow (also called Z flow) uses a double pass design that causes the water/coolant to pass through the radiator core twice before existing out the return port. This results in increased cooling of 30%-40% over stock & 10% over standard R-Cores w/out N-Flow. The ultimate for extreme cooling & with for use with a FIMC. Thicker than stock but bolts on like OEM with no modifications needed. (direct fit) Fully polished to a mirror finish and provides 20% to 30% more cooling compared to the standard OEM rad. All Koyo aluminum radiators are made from aircraft quality aluminum with heli-arc welded cores that are NOCOLOK-brazed. They are built to handle high revving, high performance motors, and is perfect for N/A & turbo applications.

Fits both N/A & TurboII S5 (89-91) FC3S Mazda RX-7’s
Core Type: N-Flo Dual Pass
N-Flow?: Yes
For Manual Transmission Only (automatic transmissions will require an external transmission oil cooler)
This item is normally in stock & ready for immediate shipping.