There are no direct upgrade replacements. I would say get some perma-cool fans but they are hard to source these days. Other than those, I'd say get 2 12" mishimoto fans
do you need a recharge on your ac? do you have a slow leak? how long does it take from a complete stop to have the ac "useless"? i think aftermarket fans are a waste of money.
Just raise your engine RPMS up to 1500 when your at a stop and the AC will blow cool, unless your system is leaking or a component is not functioning correctly.
I thought that you were looking in to getting a cat less pipe made up, that would be more beneficial than a turbo back exhaust, the racing beat muffler is not holding you back like the factory catalyst pipe.
i think aftermarket fans are a waste of money.