Rev9Power Rev9_WG-008; RS-Series Wastegate For 44mm V Band Flange Product Details 44MM V BAND RS-SERIES WASTEGATE (universal) "- Includes 5 psi , 10 psi , 11 psi wastegate spring - Dual port. accurate boost - Ultra durable diagram (diaphram) - Includes with all the hardware (bolts, gasket etc) - Accurate boost pressure - High quality appearance - Simple one step process for removing or installing different wastegate springs This wastegate is 4.10" inches tall. 5 psi spring : outer diameter 29mm / length : 36mm ( inside the wastegate ) 10 psi spring : outer diameter 44mm / length : 68mm ( extra spring) 11 psi spring : outer diameter 36.5 mm / length : 52mm ( extra spring) Example: You can use the 5 psi or 10 psi spring alone or combine them up together for 15psi , or combine them all to 21 psi