The car has 97.000. Just changed the spark plugs, B1 S1 sensor, B2 S2 sensor, air filter. The car had gone into limp mode several times, and was lacking power.
It has the following VAG codes:
16805 Warm up Catalytic-Bank 1 below efficency Thrhld
17965 Charge Pressure Control Poitive deviation
17537 Fuel Trim Bank 2 System Rich
17535 Fuel Trim Bank 1 System Rich
16487 MAF sensor Signal High

The last three appear to be related to the MAF. I have ordered a rebuilt MAF, a N75 valve, APR bi-turbo pipe, and 2 Forge DV's. Any other suggestions???

Thanks in advance!