This 6061-T6 all aluminum competition radiator features a heavy duty 1.125inch core, and bolt in replacement into your RX-8. This radiator will keep your RX-8 rotary engine cool. Featuring a multi louvered fin design, this race radiator is equivalent to a 3 row radiator in cooling performance, but without the added bulk. Bolt in installation. No modifications required. This is the BEST radiator your can get for your street RX-8.