The stock system is more than adequate to handle the heat.

Agent Mike, I recommend you look into replacing your fan clutch if your car is running upwards of 100*. My car on hot days was easily topping upwards to the 100* mark before I replaced mine. Others told me this was normal, but it really isn't.

My fan clutch had long gone bad, replacing it is stupid easy and a new clutch can be had for under $40 on Ebay. The only caveat is, most of them aren't stored properly so it will run and sound weird for about a week until the clutch goo inside redistributes itself.

The temp should stay somewhere between 85-90* with short bursts up to 100 if you're pushing her hard.

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-Typos courtesy of my mobile phone.