Cobb makes the best DP on the market. They're the only ones using a cast iron merge collector for instance. Their build quality is the best. You get a catted pipe instead of uncatted, which reduces the risk of boost creep and also can keep you in compliance with emissions laws in states that do visual cat inspections. I also think they have the best sound of any DP on the market. It's not just the mufflers that make your car sound like it does. The DP plays a big part in that. But you pay a premium for a lot of little things that don't add power over cheaper options. Because of that, most people don't spend the extra $200 or so over an Invidia or other brands that aren't catted, are made of cheaper materials, and don't have as good a build quality. It's really up to you in terms of whether you're the type of person that always wants the best, or you'll be happy with a slightly cheaper option that gives you the same amount of power.