* Mazda B6-ZE 1.8L I4: This engine is a direct swap for the stock engine and produces 130 hp and 119 lb-ft of torque.
* Mazda B6-BP 1.8L I4: This engine is also a direct swap for the stock engine and produces 140 hp and 125 lb-ft of torque.
* GM LSX V8: This engine is a popular choice for Miata swaps due to its large displacement and power potential. The LSX family of engines includes the LS1 (5.7L), LS2 (6.0L), and LS3 (6.2L).
* Ford 2.3L EcoBoost: This engine is a modern turbocharged four-cylinder that produces 310 hp and 350 lb-ft of torque.
* Honda K-series I4: This engine is a popular choice for Miata swaps due to its high-revving nature and high-power potential. The K-series family of engines includes the K20 (2.0L), K24 (2.4L), and K30 (3.0L).
Ultimately, the best engine swap for your Miata will depend on your budget, goals, and the level of performance you're looking for.
