Primary: 42.7mm. Secondary: 42.7mm. Tail: 48.6mm. This is an Exhaust Manifold compatible with factory one made by stainless. JUN devised pipe shape and a diameter not to disturb a flow of exhaust emission and reviewed balance between exhaust flow quantity and exhaust pressure. As a result, start of a turbo in the whole rev became smooth. It is possible to disappear to blow down completely by separating it into 1-2 and 3-4 just before the turbo becomes 50m/m by designing it to be 4-2-1 manifold, and designing it to stand up smoothly from the low rotation.
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