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My house is plumbed using PEX trunk-and-branch, with the main 3/4 line coming in, splitting off to 3/4″ to the hot water tank, and then a 1/2″ trunk that all the other branch supplies tee off from. Hot water is the same, with a 3/4″ line coming from the tank and splitting to two 1/2″ lines.

The pressure changes when you are using a faucet or in the shower are very noticeable as other fixtures are used, particularly with the washing machine.

I need to do a couple of changes anyway (including adding an outside tap), am both experienced with and have all the tools for PEX, and don’t mind spending a couple hundred dollars on this. How much of a difference will I notice if I:

1. Replace the 1/2 “trunk” lines with 3/4″

2. Replace the 1/2″ trunk lines with a PEX manifold

I’m just looking for someone’s experience/anecdotal evidence that it would not be a complete waste of time/money to do this.