Prepare your spaghetti as directed. Meanwhile, chop up your pepper, onions and garlic. Now, heat up a sauce pan on medium heat and saute your peppers and onions. Add your garlic last so it doesn't burn. Next add your BBQ sauce and marinara sauce, then add your chopped up chipotle peppers. Mix together and bring to a slight simmer. Now add your meat and let all the flavors meld together for another 5-10 minutes.