I just spotted this new ramen place when I visited my local Wahoo's for lunch today in Costa Mesa. I think it's occupying the same spot as a former ramen or noodle shop. I forget the name of the previous tenant, but I remember reading a couple of reviews here on Chowhound maybe a year or two ago before it closed.
It's called Mentatsu Noodle House, right next to the Mother India restaurant. It's closed on Tuesdays, so I couldn't see how busy it gets. But looking at the menu on the window, it looked like it had its fair share of ramen bowls in the $6-7 range, with some bento box entrees also.
I'll likely check it out next time I'm in the mood for ramen, and I'll write up a review.
Mentatsu Noodle House
688 Baker St. #7
Costa Mesa, CA
Mon, Wed-Fri 11:30AM-2:30PM, 5PM-1AM
Sat, Sun 11AM-1AM