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Tubular exhaust manifold built from equal length mandrel bent stainless steel pipes, allowing quicker evacuation of exhaust gasses from the cylinders as well as separation of gas flow until reaching the collector, all resulting in a significant improvement in spool-up. Reduced back pressure also allows higher top-end when fine tuning boost and ignition maps. The end result is a very high degree of driveability even with very large turbochargers. We strongly recommend combining this with a large downpipe to optimize flow all the way through. Manifold is delivered with a T25 turbo flange.