yeah, there are ways to improve the water pressure but only slight improvement may b 5%. You can actually get some feedbacks from Forumer REEN YONG. Recently she listened to her plumber, modify her piping to main water, use bigger pipes and only convert to 1/2". Basin taps modify to use PVC pipes for the connection instead of flexible hose. Total cost ard RM 400. Result, not very satisfying, she is now going to spend extra RM 1k+ to buy a grundfos water pump from me. Wasted the RM 400+ that her plumber recommended her to do.

Here is a video of before and after installing a Grundfos CH2-50PC
http://www.youtube.com/watch?v=0xLScYj9-Bk