What is the most horsepower you can get out of a rx-7 engine?

The Mazda RX-7 is known for its rotary engine, with the most powerful variant being the 13B-MSP engine found in the RX-7 Spirit R, producing around 276 horsepower. However, with modifications such as upgraded turbos, fuel systems, and engine management, enthusiasts can push the output significantly higher, often exceeding 400-500 horsepower in highly tuned setups. Some racing or custom builds can even achieve over 600 horsepower, depending on the level of modification and tuning.