3MM CAST PIPING RAM HORN TURBO MANIFOLD FOR 1.6L/1.8L HONDA CIVIC AND ACURA INTEGRA B16/B18 A performance tuned turbo manifold ensures quicker and smoother flow of exhaust air to increase engine output and efficiency. Vacating exhaust air faster allows more intake air into engine cylinders for better combustion. Moreover, having separate ports and tube paths for each cylinder eliminates interference between exhaust pulses and thus reduces backpressure. Like most contemporary high performance turbo manifolds, this product features an equal length runner design. It ensures that exhaust pulses hit the turbine of a turbo evenly, which results in a much quicker turbo spool-up. The piping is constructed from 3mm schedule cast steel tubes with patented craftsmanship and TIG welded at all joints in order to offer extraordinary durability under frequent extreme operating conditions, making this manifold an ideal upgrade from its ordinary stainless steel piping counterpart for only those top class racing engines. IMPORTANT: This product fits B16/B18 DOHC engines only.