Hey there, and welcome to JeepKJ!
Here's what the service manual has to say about the speakers. I'd say unless you're getting a pretty powerful head unit or using an amp, you should be ok. And worst case scenario? Blow the factory speakers, go to
Crutchfield and get yourself some replacements
I cant find anything for the wattage of the standard speakers in the manual, guessing you could prolly pull the speaker out and look on the magnet, might be some indication. And this is out of the 02-04 manual, so your results may vary.
-Blu
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STANDARD
The standard equipment speaker system includes speakers in six locations. One 6.4 centimeter (2.50 inch) diameter speaker is installed on each end of the instrument panel top pad. One 16.5 centimeter (6.5 inch) full-range speaker is located in each front door. There is also one full-range 16.5 centimeter (6.5 inch) diameter full-range speaker located in each rear door.
PREMIUM
The optional premium speaker system features six Premium model speakers in six locations. Each of the standard speakers is replaced with Premium model speakers. One 6.4 centimeter (2.50 inch) diameter speaker is installed on each end of the instrument panel top pad. One 16.5 centimeter (6.5 inch) Premium woofer is located in each front door. There is also one full-range 16.5 centimeter (6.5 inch) diameter Premium full-range speaker located in each rear door. The premium speaker system also includes a power amplifier mounted to each front door speaker. The total available power of the premium speaker system is about 160 watts