Horsepower and Torque at the wheels will respectively be referred to as HP and TQ.  In tank or low pressure fuel pumps will be referred to as LPFP and rail or high pressure fuel pumps will be referred to as HPFP.  Multi point injection or port injection will be referred to as MPI. The factory fuel system can support over 350 HP using gasoline so we're only going to mention the limitations of ethanol with these components.  Here's a quick rundown on our fueling recommendations for the MQB platform:

LPFP

The LPFP is what brings the fuel from the tank to the engine compartment.  This is the beginning of the fuel system and it must be able to support all components under the hood including the HPFPand MPIif so equipped.  An upgraded HPFP or additional MPI kit cannot make up for a stock or undersized LPFP.  So when we say a LPFP is good for 600 HP, that means it is supplying 600 HP worth of fuel to the HPFP and to the optional MPI kit.  The HPFP and MPI are restrictions to the LPFP and will only supply the engine with what they can flow.  With this information in mind, we recommend using:

Original LPFP for combinations making up to 350 HP

Walbro 450 LPH LPFP for combinations making up to 450 HP

RS3 Brushless LPFP  for combinations making up  to 600 HP

We don't recommend use of the Walbro 525 LPH LPFP as it requires a separate module to operate it which exceeds the cost of the RS3 pump, but not the performance.  If you already have a walbro 525 pump and aftermarket control module for it, we're happy to tune it for you, but we choose not to sell them.

HPFP

The HPFP increases fuel pressure supplied to it from the LPFP.  This increased fuel pressure is fed to the direct injectors installed in the cylinder head beneath the intake manifold.  The HPFP still relies on having enough fuel provided to it by the LPFP.  These are our recommendations for the HPFP:

Original HPFP for combinations making up to 280 HP

Autotech HPFP or similar for combinations making up to 350 HP

MPI

There are many MPI kits out there and they all accomplish the same goal which is to provide more fuel to the engine than the factory fuel system can provide.  You do not need to upgrade your HPFP when using an MPI kit as the amount of extra fuel provided by the MPI kit is enough to overcome the limitations of the factory HPFP systyem.  The MPI kit does though still rely on having a supporting LPFP.  Here are our MPI kit recommendations:

Precision raceworks 925cc MPI kit for combinations making up to 550 HP

Precision raceworks 1300cc MPI kit for combinations making up to 700 HP

To get the most out of your turbo we recommend installing an intercooler, Air intake, and downpipe.  These parts are necessary to achieve the advertised power ratings of our tuned packages.