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I have 05 reg astra will be needing a new inletmanifold. If i get a new one will i need to have it programmed so the ecu can talk to it or is it simply plug an play after its all been fitted.

How do the new inlet manifolds differ to the old ones.
 

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The new ones just have slightly beefed up swirl flaps so they shouldn't break and jam if they get a bit sooty.

And I don't think they need programming but a new manifold should have a new swirl actuator as the actuator learns the characteristics of the manifold so the old one won't work as well as it should.
 
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