1. In a large stockpot over high heat, bring 4 quarts of salted water to a boil. br> Add two tbs. olive oil.
2. In a large saute pan over medium high heat, add remaining 2 tablespoons olive oil and sausage. br> Cook until sausage is browned, about 6 minutes. br> Add zucchini, squash, onions, red pepper and 1/4 cup chopped basil and cook for 4 to 5 minutes, or until the squash has begun to caramelize. br> Season with salt and pepper.
3. Add pasta to the boiling water and cook until just al dente, about 5 minutes. br> Drain reserving 1/2 cup pasta water.
4. Pour cooked pasta and 1/2 cup pasta water into the sausage sauce.