Most vegetarians I have known are also pretty big on eating organic foods and such, so MSG isn't a problem for them. I'm not sure it is related to you being vegetarian anyway. MSG bothers lots of people.

I'm pretty sure in ramen, the MSG is in the flavoring packet, so you could eat just the noodles. I bet you can flavor them up by adding veggies to the water. There are ways to make a pretty tasty vegetable-based soup stock.

If you want/need to get MSG out of your diet, for the most part your only choice is to avoid all those packaged processed foods.