Usually, this brazilian amps are available in 1 and 2 ohm version.
Usually, in 3k 1 ohm version you can fit 150v 80/100A mosfets (like IRFB4115 or IRFB4321) because, due to the low impedance capability, you must have low rail voltage and high current mosfet.
In 3k 2 ohm version you can fit 200v 70/80A mosfets (like IRFB4127 or IRFB4227) because, due to the (relatively) high impedance capability, you must have higher rail voltage with a lower current (for driving limits, because if you use a mosfet with a higher maximum voltage, you will necessarily have a lower current, otherwise the mosfet will be too heavy to drive if you choose high voltage and high current FETs).
Also, at 2ohm you can use a mosfet with higher voltage and lower current because the power will be realized with a lot of voltage and little current, due to produce the same power of the 1ohm version but at 2ohm.
This are the mosfet that i use.
