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what kind of filter?
Is it a replacement element, or an entire induction kit?
i.e. I take it you didn't mess with the airflow sensor on the intake tube?
There are three possibilities:
1. you've got a blockage in the airflow. This'll 'choke' the car up and you won't be able to rev much.
2. you've knackered the airflow sensor and the ECU is dumping the wrong amount of fuel in. Doing an ECU diagnostic should show this. (also check the cables).
3. you air filter is too small for the engine (unlikely).
hope this helps...
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