Saturn SL1 2002

Hi, I just purchased a 2002 Saturn Sl1 last week. I noticed, after a week
of driving it, that when I first start it up, it sounds louder. When it
warms up (usually about 2 miles) it then purrs like a kitten. Is this
normal? This is my first Saturn and I also don't know much about cars. I
have an 18,000 mile warranty but I was wondering if this is normal before
I contact the dealership. I have had many old undependable vehicles, so I
am wondering if this is just me being afraid something is wrong with my
new one. Other then that the car runs like a dream. It also has 69,000
miles on it and it is a 5 speed manuel. The dealership said they inspect
all their cars thouroughly before selling and fixing anything that needs
fixing. Any help would be greatly appreciated. Thanks.