G Reddy Surge Tank / Intake Plenum For Nissan S13 with SR20DET engine (Red Top)Maximises air supply to the engine Ideal for use with an aftermarket turbo Large volume collector tank with tuned runners Compatible with OE throttle body Made in Japan G Reddy part no. : 13522319G Reddy Surge Tank for Nissan S13 Specifications Manufactured to make the most of the SR20DET engine in the Nissan S13 (Silvia and 180SX "Red Top" engine), this high-volume, high-flow G Reddy cast aluminium plenum is ideal for use with aftermarket turbochargers. Its design allows airflow to enter each cylinder undisturbed and evenly for improved engine performance. Key Features To fit SR20DET engine with short port head (Red Top)Tank capacity : approximately 1.8 times the OE ratio (+80%)Compatible with the factory throttle body Please note : as the mounting position is different from stock, some intake pipping and fuel feed modifications may be required.