The upper intercooler piping starts with a smooth mandrel bent 2.5" stock turbo outlet pipe which connects to the remainder of the hot side piping. The stock turbo outlet pipe is separate to allow it to be swapped out with the installation of our EVO X turbo kit to come so that the remainder of the upper piping can be retained. This ensures that you never have to "upgrade an upgrade" and spend more money on a new upper pipe when it comes time for a turbo kit. Making the connection from the turbo outlet pipe to the intercooler is a single-piece mandrel bent 2.5" upper intercooler pipe.