What is one of these?!

That is the resonator for the airbox i think. Just liek the one i have on my Focus. Follow where the air goes into the airbox, if that part goes into the airbox before the air is filter, take the resonator off and rev the engine. :cool:
 
iCraig said:
Well, I'd say so. Or else Ford wouldn't of fitted one in the first place.

All it does is make the engine quieter when you put down large amounts of throttle. When you normally cruise it is no louder, or you cant hear it.
 
saitrix said:
All it does is make the engine quieter when you put down large amounts of throttle.

Then it has a purpose, and is needed for that.

If he wants his engine to be louder at full throttle, by all means he can leave it off.
 
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