Choosing the correct wastegate is vital to the response and ability to control boost properly. Don't work outside the limitations of your wastegate, pick the right one. This new Turbosmart Twin port IWG gives you improved ability to control a wider range of boost from your internally wastegated turbocharger. Out of the box it includes a 7PSI inner spring and a 7PSI outer spring, remove one for 7PSI or keep them both in for 14PSI, additional springs are available for purchase.