For Nissan 240SX S13/S14 Silvia Turbocharger+Turbo Manifold+Downpipe+Elbow Exhaust - SR20DET T25 Turbocharger - Turbine A/R: .86 / Capable of 5-28 PSI output at peak power performance / Internal wastegate setting: 8 PSI Turbo Manifold - Standard T25 turbo flange configuration outlet Elbow Pipe - Standard SR20DET T25G inlet flange / 2.5" outlet Downpipe - 2.75" inlet / 3" outlet / 3" piping diameter Professional installer is highly recommended; no instruction included