Any exhaust shop should have no problem fabricating that "test pipe" with cutout. If you don't want to cut up your existing resonator section, they'll need a flange, donut gasket , 3" piping. However, it will likely cost you more $$ than just ordering it from the dealer. It's a resonator replacement pipe PN is 9L3Z-5A212- XX for different cab and tip configurations. They're ~$60-80 depending on which XX. You can buy the electronic cutouts on EBAY