What is the most powerful NA engine?

Currently, the most powerful naturally aspirated engine in the Malaysian market is the Honda L15ZE 1.5L DOHC i-VTEC engine, which delivers a maximum horsepower of 121 PS @ 6600 rpm and a peak torque of 145 Nm @ 4300 rpm-figures that lead among peer 1.5L naturally aspirated engines. Additionally, it adopts a multi-point fuel injection (PFI) system to enhance fuel adaptability and durability, making it particularly suitable for local road conditions and fuel quality. While the Mazda Skyactiv-G 1.5L engine (114Hp/148Nm) and the MX-5's 2.0L Skyactiv-G engine (184Hp) perform well in specific scenarios, the L15ZE remains the strongest NA engine in the mainstream family car segment when considering overall power parameters and market positioning. Notably, although Aston Martin Valkyrie's 6.5L V12 engine (1160Hp) is the world's most powerful mass-produced NA engine, its supercar nature and multi-million-dollar price tag render it irrelevant for reference in the local market.