The XR6 Turbo runs the same injectors as the N/A engine, only increased rail pressure The fuel delivery system is up-rated to 4 bar, a 40 per cent increase on the standard fuel pressure. The turbo 6 has a larger capacity in-tank fuel pump Are you doing an N/A to turbo convertion, if so a Malpassi pressure regulator will increase rail pressure to around 4 Bar if you can't find a XR6T one I'm doing a conversion soon, just getting some parts together