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on my 2.2 sri estate, can someone please tell me what it is between the air filter housing and the slam panel, to the right of the radiator?

it is connected to the air filter housing, but only has one hole. whats it for, is it needed? if i remove it, can that be a way of getting more air into the engine?

Edit by Dai: Fixed the pic for you mate

Did we get the right picture here? There's an "air resonator" on the diagram (8), is this it?

Yeah, I know it's a 2.0, there's no 2.2 diagram on ppc but it's the same. However, the coupé doesn't have it

Resonator?

I didn't realise it was a 2-stroke

It is indeed item 8 on the diagram. What does it do? Why doesn't the 2.0 have one?

My guess would be that it would quieten down the induction noise and/or provide smoother airflow to the engine

The 2.0 engine probably sucks in a lot less air given the relative power outputs

But the 2.0 has one, the 2.0 & 2.2 coupé do not.

2.0 coupé for comparison:


Although now I'm looking at it, I see the filter box has the inlet at the front (different part number though - blanked?)

Had a squint on the couple club forums (you should try it sometime ), the coupé has got one, it's that bit on the back end of the filter box.

As mjb said, it is there to stop induction 'roar' or that deep kinda nasty sound on full throttle, low speeds...

so i could remove it then with no ill effects - might see how it goes for abit and see what happens.

thansk guys.

well i've taken the resonator off and i am proud to report (lol) an increase in roar when throttle is wide open and revs are above 2500, and it may be my imagination, but it seems to pick up a little better too.

gonna keep it off for a bit and see how it goes. the increase in roar is no where near annoying and if driven sensibly, there is no difference.

I will be buying a length of 'induction' pipe so i can route some more cold air to the airbox. little job for the weekend!

My 1749 has got it.I took it off once,It sounded like a council estate corsa so it went back on.

well i fitted thecold air pipe to it and routed it down to below the battery area and its quietened it down loads again.

Had a look in my engine bay this morning as I was filling up the screen wash tank.

I don't have one of these things on my airbox. Mine's the 1.8i 16v D9.

Oh no, it must have fallen off!!