I've heard that you can remove the plenums off the butterfly valves on the intake mani, which gives you better top end power, but crappier low end, has anyone ever done this or know someone that has? and would it be worth doing?

 

it can be done. but as you said, it will result in crappy low end. honda put them there for a reason.

 

dont remove them....if you really dont like them that much then just get the skin2 ITR copy manifold.

 

You can actually just pull the vacuum line off the diaphram and they'll stay open all the time. I never really noticed a difference when I tried it on mine, but then again, I never really drove like that for long. You'll still have the butterflies themselves in there, but I doubt they'll block much flow. I'd just leave the system working like it should.