The reason for having them in is to increase the air speed entering the cylinders at low rpm - improving fuel economy and running etc. etc. As rpm increases, or load they open to allow more air into the cylinders...
If you want more air into the cylinders at higher rpm and not so bothered about the lower rpm - I'm not sure how different it is but I do have a inlet mani with them removed. Then take them out, but while you are doing a more important mod IMO can be done - porting the inlet mani.
Because of the rubbish design of the MPS inlet mani the flow characteristics across the 4 'runners' are different, number 3 being the 'best' which actually makes it the worst. What happens is that cylinder 3 runs slightly leaner than the rest ,so when the power is increased and the fuelling is leaned out, cylinder 3 is prone to detonation an ultimately engine failure.
What you can do at the same time is grind out all the excess metal in the mani to match the gasket, this will help balance out the runner air flows. It's not great but better than oem. Example below, if you search MSF there's a page where it details the flow characteristics of the available inlet mains and mention oem and ported stock mani's.
From memory the RS mani is the most balanced.
