Yep, simple as cutting it and using a file to smooth it out - don't remove the sampling tube or the 'step' in the housing, these apparently are vital to airflow
From what I have read, what happens is the MAF will obviously flow better, but as the whole thing has been calibrated from factory when they develop the car, the mod may skew the air mass readings slightly. You are relying on the fuel adaptives in the ECU to find this error and correct it, and for the most part it does. Depending on your system you may get a lean code on one or both banks (I had it on one). This is bad, as the code causes the vehicle to revert to default fuelling tables, which will not deliver quite the correct mixture (in reality you probably won't notice in day-to-day driving) There are a few ways around it, and the main one documented on the audiworld forums is to put an o-ring into the sampling tube, I believe this reduces the diameter, increasing velocity in the sampling tube, thus tricking the MAF into thinking there is more air going in. Another way is to bump fuel pressure up slightly to increase the fuel delivered for a given injector pulse so the mixture starts off closer to ideal.
From what I have read, what happens is the MAF will obviously flow better, but as the whole thing has been calibrated from factory when they develop the car, the mod may skew the air mass readings slightly. You are relying on the fuel adaptives in the ECU to find this error and correct it, and for the most part it does. Depending on your system you may get a lean code on one or both banks (I had it on one). This is bad, as the code causes the vehicle to revert to default fuelling tables, which will not deliver quite the correct mixture (in reality you probably won't notice in day-to-day driving) There are a few ways around it, and the main one documented on the audiworld forums is to put an o-ring into the sampling tube, I believe this reduces the diameter, increasing velocity in the sampling tube, thus tricking the MAF into thinking there is more air going in. Another way is to bump fuel pressure up slightly to increase the fuel delivered for a given injector pulse so the mixture starts off closer to ideal.
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