In a large pot of salted boiling water, cook bowties until al dente. Drain and return to pot.
Make dressing: In a small bowl, whisk together mayo, sour cream, pickle juice, Dijon, and garlic powder and season with salt and pepper.
Assemble pasta: In a large bowl, combine cooked bowties, cooked bacon, cheddar, dill pickles, and dill and toss with dressing.
Garnish with pickles and serve