we just got our '07 SE 4cycl Auto Camry almost a week now

, new with only 6 miles on it.....and here's my issue.
when accelerating in 1st & 2nd gear, the engine sounds pretty loud like it's pulling a heavy load or going up a very steep incline/hill. and this is just slowly acclerating, not flooring on the gas pedal (which i don't recommend doing on a new car.) i didn't noticed it driving it home from the dealer becuz the wife and i were busy talking. but a few days later when i drove it again, i noticed it. told the wife and she says it sounds fine/normal to her but today she told me that her engine does sound loud.

is this normal for the 4cycl or is there something wrong with it?
will be making an appointment to bring it in to get it checked out but just wanted to see if any of you Gen 6 Camry owners notice this in theres also.
thanx TN