The best way to get any noticeable amount of additional power out of that little 1001Z is to leave it just as the factory issued and simply connect it to a little Italy RM KL 203P amplifier and then to the antenna. For less than a hundred bucks, this little amplifier will boost your signal by 50 or 80 watts or so, which will get you heard. And since the 203P draws only 10 amps, it doesn't take anything larger than standard 10 gauge automotive wiring to keep things happy.
Of course, all this is assuming you've got a good antenna, which should be as tall as you can stand it. The longer the antenna, the better the communicating no matter how many watts are going out of it. My personal choice is a 4.5-foot Wilson 500 for my sedan and a 5.2-foot Wilson 1000 for my F250, both magnet-mounts.