The drop-in, stock-appearing Screamer GT37 turbo kit for the early model Ford 6.7L Powerstroke that not only replaces the problematic and small GT32 Single Sequential Turbocharger (SST), but also utilizes modern turbo technology that delivers increased airflow without compromising on low end response. Boost pressure can be increased to improve horsepower potential. Everything you need is included to drop right in place of the old unit, no extra pieces needed. The Powerstroke Retro Screamer turbo will require tuning to ensure no faults codes are set - to optimize the high flow we suggest a tune by PPEI. We recommend the non-screamer Retrofit kit (1045824) for all trucks with the stock CP4.