Teruyoshi Iwai competes in D1 Grand Prix in his Mazda NA Roadster for the R Magic H.D.O D1 Racing Team. Under the hood sits a 1.3 L 13B-REW two-rotor connected to a HKS sequential transmission with a EXEDY Hyper Carbon-R triple-plate clutch. The engine makes 542 hp (550 ps) thanks to a Garrett GTX3582R turbocharger and APEXi Power FC ECU. The Roadster rides on a set of 326 Power adjustable coilovers.
Source: Teruyoshi Iwai FB page