I have a used Precision Raceworks modular stage 2 lpfp (Walbro 450) for sale. Will work on e series n54 and n55. This is the modular version that allows you to add a second pump purchased from them. Here is a link to the product:
https://precisionraceworks.com/produ...39390225957057.
Price is 215 shipped. Located in Carlsbad CA.