Should I get an aftermarket fuel rail?

Typically, the stock fuel rail on the 4G63T engine is designed to handle the fuel demands of the factory power output. In its original configuration, with stock fuel injectors and fuel pressure, the stock fuel rail can typically support horsepower levels in the range of 250 to 300 horsepower.

If you are planning to modify the engine and increase its power output significantly, it is generally recommended to upgrade the fuel system components, including the fuel rail, to ensure adequate fuel supply. Aftermarket fuel rails with larger internal diameters, improved flow characteristics, and higher fuel capacity are available for the 4G63T engine. These aftermarket options can better support increased horsepower levels, especially when combined with larger fuel injectors and a higher-capacity fuel pump.