The only way to do it right is dyno the truck with a stock ported one three times, then hurry up and change out the air horns and do the same with Ricks. Then take the averages and see what you get. Another thing, ask your self these questions, how restrictive is the stock air horn ported? Is it restricting the stock turbo? Does the stock turbo pull in that much air that the air horn thats larger than the stock wheel is holding it back? The extra noise can give false sense that it is working better and making more power. Ricks is a good option if your air horn is stock and don't want to mess porting it. If it's ported already who really knows other than more noise what you'll really get. Test it with hard facts and tell us what you find.