Some people choose to rewire with everything fresh...and use thicker wiring. I have my CDT comps running from an amp from a small amount of factory wiring running 75 watts or so....ain't no way there gonna catch fire UNLESS you use too small of a wire gauge and really crank those speakers.
You should be fine running that wattage on the factory wiring, unless you were running hundred's of watts, then I'd say change out the wiring. I ran 16 gauge which should be fine with you also if you choose to use that same gauge.
I sorta did with my s10 here's a few pics Notice the 3 top screws on the speaker when I 1st removed the door panel lol. Whoever installed them should be shot. No screws on either side, nor the bottom. Also got rid of that thick wire harness.....it's only 2 wires coming out of it. Unnecessary to have imo.
'97 4 dr. Tahoe
Polk Audio MM6501
Wolfram amps 3000.1, 125.4 coming soon
2 Sundown Audio X 15's Tuned @ 30Hz.
Interstate battery/Royal Excelene/KnuKoncepts Kolossus wiring