Why would the Builders that have replied so far, tell you to stay with the stock Pump / Plate, Harley parts that they can make little to no profit on vs the feuling crap that has margins??
My guess is that they have direct experience with feuling crap, their dismal quality control and tech support that is a joke?? Just a guess

1) Due to my direct experience with feulings dismal QC & terrible customer support, the '09 SERG has the most expensive cam plate on the planet.
2) Last year I had all the components in the Cam Chest of the '05 SEEG (55k mi.) replaced with Stock HD (no issues, just a "going out of ESP" PM if you will). Other than the feuling reading about 5psi more on cold start / fast idle, the Oil Pressure gauges of both bikes (Stock nib vs feuling nib from one of their distributors ) read exactly the same under all conditions including "heat soaked" idle... The Stock replacements worked fine "out of the box", one & done, the feuling crap required going into the Cam Chest 3 more times (under feuling's direction, "try this, try that", verify the gauge, etc...instead of overnighting different components that might have had some qc, see dismal / terrible above) before the Oil Pressure was fluctuating normally... Finally the 4th time was a charm when the distributor had feuling overnight a new pump/plate. The distributor still has not been reimbursed (by feuling) for the overnight fees as of yet... I don't think he's selling too much feuling stuff anymore...
When I asked feuling to cover some of the cost of going into the Cam Chest 3 more times (under their direction) feuling was all to happy to point to their disclaimer, then click, the phone was dead...
I won't get "feulled" again...