In a medium bowl, combine cilantro, peaches, nectarines, jalapenos, red bell pepper and onion.
Drizzle mixture with 4 Tbsp lime juice.
Season with chili powder, kosher salt and freshly ground pepper.
Gently stir, do not mash fruit.
Let mixture sit for 1 hour and taste.
Season with additional lime juice, salt and pepper to taste.