XJ aux e-fan upgrade/replacement

[muddeprived]

I wired up a delay timer to my aux fan so it kicks on for a minute or two after ignition is turned off. This is to help with the misfire issue. But anyways, the stock e-fan is LOUD and annoying. It almost feels like the motor is running when that fan kicks on. I want to upgrade or replace it with something of equal specs or better. What size fan should I aim for to fit inside the stock shroud? I know I will have to modify it to fit but that's no biggie. I just want to make sure I get the right size and good cfm.

Let me know what you know.

Thanks!

Chris