I just completed the 044 pump upgrade. It's really straight forward with the right fitting from TurboKraft. It's the black one in the pic. This screws into the 044 and give you the barbed end needed to connect to factory inlet line.
The stock 993 pump is rated at 205lph/4bar@12v. The 044 pump is rated at 240lph/4bar@12v. Not a huge upgrade but I'll take the 17% added headroom for piece of mind. I was getting pretty close to the limits of the stock pump.
*Electrical connectors need to be changed. The large spade goes on positive with the 044. It's the other way around with factory connectors.
*Change tank inlet filter. Mine was not clogged but it did start to collapse. Only 31k miles.
*Reuse all the stock mounting hardware. I've seen guys cut the rubber isolator boot off the pump and clamp new pump to the bracket. Makes for a VERY noisy pump. Mine is dead quiet. Just like stock.
*Pay close attention to the clocking of the pump on the mount. Positioned correctly the pressure side is not kinked and does not rub.
*Should have started with less gas! Draining 1/2 tank was no picnic!
*Read up on fake vs real 044 pumps. The fake ones could cost you an engine!
TurboKraft fitting: https://parts.turbokraft.com/collect...ront-bosch-044