Special Note Regarding Fuel Pumps on the 2.0T: There is some debate regarding the performance effects of the high pressure fuel pump, found in the engine bay and required to produce the extremely high fuel pressures of the FSI system. The factory has superceded the high pressure pump part number from 06F127025B to 06F127025F. There is no definite cutoff date when cars began coming equipped with the 06F127025F part number, and the only real way to tell which pump your car has is to remove the engine covers and look at the part number on top of the high pressure pump. On the B7 chassis A4, the pump is located near the firewall at the end of the fuel rail as in the below picture. On all other 2.0T cars, it is found at the end of the fuel rail towards the driver side front of the car.
If your vehicle is equipped with the old part number pump 06F127025B, we recommend using the Sport Flashloader chip program available for your vehicle to prevent surging issues, especially if you have an aftermarket high flow cat and exhaust system. GIAC has done extensive testing on multiple 2.0T vehicles and has found a correlation between surging with higher boost levels with the old pump number. If your vehicle is equipped with the new part number pump 06F127025F, you can opt for the X-Chip Flashloader file if available.
