In my opinion, it would be. You are probably okay with the factory alternator, but I'm one of those "replace it with something better, if you can" guys. The CS130Ds run extremely hot and don't last as long as the CS144s, the CS144s put out more power at idle, etc. The CS130D puts out maybe 60A at idle. The CS144 can put out up to 100 at idle.
Here's the output graph of the CS144.
CS130D:
You have a 125a version, so the graph would be a bit better, but you can see the drastic difference. Let me go look up the pulley sizes...
