Turbosmart Internal wastegate (Back Pressure) Fits Borg Warner B2 frame turbochargers: 7064 7670 8374 9180 9280 Do you have any of the following frames (B1) another Turbosmart wastgate has to be used: 6258 6758 7163 See pictures for measurements and spring pressure chart. For single or twin scroll turbine housings Turbosmart internal wastegate. Provides faster turbo response and smoother regulation. This wastegate holds very high quality and is suitable for most turbochargers with internal wastegate where you want to upgrade in conjunction with tuning, reliability or if original wastegate fail to meet the new higher boost pressure. This wastegate has an extra connection underneath the diaphragm to work with back pressure for better control.