Combine lettuce, cabbage, carrots, crunchy noodles and green onions in a large bowl. Whisk together peanut butter, vinegar, water, pepper flakes, sesame oil, soy sauce, and sugar in a bowl. If the dressing is still too thick you may add more water. Toss the cabbage mixture with the peanut sauce and place on a large platter. Top with extra crunchy noodles and chopped cilantro.