I also have the 3.2L with an auto tranny and have noticed the same thing. Have you made sure to turn off the traction control (button is in the glove box)? This usually doesnt seem to be needed except when punching the gas in a tight turn or under careless throttle application on wet pavement, but it could be getting in your way a little bit. I recently installed the "TonyA ram-air intake" and found it definately gives me more response in the low rpms. Until you perform this mod or replace the stock airbox with the Volant as others have done, you dont realize just how much the engine is bogging down especially below 4000 rpm. The engine will be a bit louder in this range though, so your sister will definately notice if youre thinking about "upgrading" her car without her approval :devil:.
Now that I've made an effort to be helpful, all the 3.6L owners are gonna come in and bash on our "inferior" engine. :thepan:
*EDIT* - my bad AznPrydeRegalRyde, I wrote this without even looking at your name, sorry for sounding like I'm talking to a noob :hide:.