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Yeah, they help relieve a lot of the parasitic loss you get from the accessories, so it frees up some torque. I think it can be a better improvement than most CAI's out there.
For a bolt on, since people say they can really feel their cai and catbacks when they put them on, it seems like the udp would be just as good as either of those if not better for the money. But I can't tell you for sure because I don't have one lol.