A bit pricey, but it delivers on its promises. This filter was installed in the car (Opel Corsa 1.3 cDTI 95HP) along with a corresponding program to reach 120HP.

Pros:
- Compared to the factory filter, it provided more torque and horsepower, as well as improved engine and turbo sound.
- It significantly increases airflow (from ~430cfm to 650cfm according to MAF measurements).

Cons:
- Slight increase in fuel consumption compared to the factory filter, so some of the improvement from the program was lost.
- This type of filter requires special oils and cleaning procedures, making maintenance costs high in both time and money.
- It is also known to let more dust and particles pass through the engine, which could have long-term effects (usually not an issue if the engine is properly maintained).

Keep in mind that the first time you install it, you may see the check engine light on because the MAF will detect more airflow than it is used to. This is normal and it will turn off on its own.

If you think you can just install it and get more power without proper programming, you are mistaken and will be wasting your money. It is a good purchase only if you want to take your car to Stage 1 (FPE).