The Pro-tech RWD Shorty Manifold for the RWD SR20DET series motor are constructed out of sch. 40 forged steel and are ceramic coated . GTAW ( Gas Tungsten Arc Welding ) construction. They are designed for the Garrett/Precision, Turbonetics, and HKS series compressors. Each exhaust flange is ½ inch thick, and are segmented for thermal expansion, they are port matched deburred and polished for less drag. ***Call For Pricing***. All Pro-tech product's are intended for off-road use only, and prices are subject to change with out notice at anytime.