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Basically nothing for the 4A-FE. It an economic engine. The 4A-GE is the performance brother and got all the supports. It depends on how much $$$ you want to spend and how much HP you want from it. The 4A-GE is a high rev low torque engine. If you want torque get something else or turbo the engine. The most HP you can get from the 4A-GE is 240HP. That's Formula Atlantic spec with 12000RPM redline.
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