First, I admit that I have not tested "all types" of electric pumps and am sure some others can provide what is needed when the stock pump is removed and replaced with an electric one. Sometimes you may not need to replace the stock pump, but can add a quiet electric pump with it or two electric pumps can be used to provide the results needed. Our tests showed that this is what we have proven to get the job done. Of the most commonly offered, such as Faucet, Carter, and Autopuls, only the Holley provided the most economical assurance of adequate volume at the pressures required for the replacement all by itself. Two models of Holleys are the only pumps I would use. Both of these are pushers and are to be mounted at the tank. Use the Holley "Red" pump with the "Red" regulator properly set for the correct pressure called out in the carburetion instructions for 12 second power street and strip cars. For faster street and all out race applications, a Holley "Blue" pump is the only one I have found to do the job.
Furthermore, the "Blue" regulator offered by "others" with this pump is designed to be used for higher pressure than the carburetion used on VW's can withstand. For that reason I use the "Red" regulator with both the red and blue pumps and now supply the red regulator with the blue pump we sell. These regulators are also the "T" for the gas line and will provide even fuel to each carb if mounted in the center with the same length line to each carb. Yes, these fuel pumps are noisy. Even when shock mounted it will make some noise. In a race car, this is of no consequence. However, for a nice quiet daily driver, it can be annoying and should be strongly considered in the use of one.
For mild street cars I would consider using a Faucet in conjunction with (after) the stock pump. The size, a small 3 PSI or large 4 PSI, will be determined by the engine's demands so you will need to know its "real" HP. In more severe cases the stock pump can be removed and one 4 PSI large Faucet can be used as the pusher at the tank and another one (small or large dependent upon needs) at the engine. Again, you can see this can be done, but requires really knowing the truth about your engine's needs and will require 2 pumps if removing the stock pump.