In a large pot, bring water to boil, add cauliflower and cook 2-3 minutes. Immediately transfer to colander and rinse with cold water. Place on paper towels to drain. Refill pot with water and bring to boil for pasta.
In a large skillet, heat 1 1/2 TBS olive oil over medium heat. Add bread crumbs and cook, stirring, until golden brown. Transfer crumbs to a bowl and wipe skillet clean. Over medium heat, cook bacon pieces until crisp; drain on paper towels. Remove all but 2 TBS bacon grease from skillet. Add garlic and cauliflower to skillet and, over medium heat, cook 2-3 minutes. Cook pasta until al dente and drain in colander. Toss pasta, bacon, cauliflower and remaining 3 1/2 TBS olive oil until well combined. Season to taste with freshly ground pepper. Serve, topped with toasted bread crumbs. Pass cheese separately. 4 servings.