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The original Opel air intake has an inner diameter of just 45mm
This Mathijssen Technics intake adapter has an inner diameter of 58mm
The original air intake of the Z20LE.. engines works as a restriction on the air flow.
With this Mathijssen Technics air intake is the air flow considerably higher.
This makes the air to the throttle body much better and that makes more engine power possible.
Very easy to assemble
(also available as a complete kit)
Also suitable for rear wheel driven cars with a Z20LE.. engine conversion in which the air intake must be rotated 360 degrees