Never use a high volume oil pump!!! If you do, you will also have to control excessive start up oil pressure along with lousy warm oil pressure. You now have two problems instead of one.
If you must have a shiny oil pump, use a polished oil pump. Never use a chrome oil pump (except for show). You want to get rid of heat not retain it!!!
Finally! You can't have oil volume without oil pressure. There goes the myth of high volume, low pressure systems for Harley. Now that everyone is selling High Volume High Pressure oil pumps, the truth comes out!!! We've been telling you this since 1990!!!