I have a stock 454 Mag with Thunderbolt ignition. I can only get 44-4500 rpms wide open. Is there any simple inexpensive things i can do to get more out of it?

Change your prop.

to one that is about 2" smaller in pitch. The best prop for the boat should be a 23 Mirage Plus, preferably labbed.

The prop im runing now is a 23 Mirage.

Thats all I get. I run a 23 mirage plus with a 454 carb I'm not sure the max RPM on the mag but the plain carb is 4600.

454mag is 4600-5000 rpms WOT range. You should be able to spin a 23 Mirage easily up to 4800-5000rpms with your boat and a 454mag. See if more trim helps. Use the trailer button to trim it a little higher if needed.

I'll try the trailer button, thanks Griff.

If i'm ohm reading 17 and higher in my plug wires should I change them? Whats the right resistance i need?