The ETS Evo Piping kit is designed to eliminate many of the unnecessary bends in the stock piping. Our complete piping kit starts off by immediately expanding into 2.5" right off of the turbo elbow. This replaces the tiny 1 3/4" factory pipe and instantly adds an extra 15hp and greatly improves spool. From here it follows the core support and wraps around to the intercooler. Once the air passes through the intercooler, it wraps around the core support up and around the stock battery location to the throttle body.