This 6061-T6 all aluminum competition radiator features a heavy duty 1.125inch core, and bolt in replacement into your 3rd gen Mazda RX-7. This radiator will keep your RX-7 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. There are cheaper radiators out there, but they are not as good. Many people have purchased the 'other' brands to save money, but end up spending more money when they have to buy AWR's radiator AFTER wasting money on another radiator that didn't do the job. Due to it's uncompromising quality and efficiency, this is chosen by Mazdaspeed Motorsports as their race radiator for the Mazda RX-7. This is the BEST radiator your can get for your RX-7.