the HFC's you will purchase will be far less restrictive then the standard units free'ing up more exhaust and allowing more flow.
I myself have installed a CBE and have HFC's waiting to go in, just need a good day to install them, for me there is still quite a restriction from about 5500-6000ish RPM till redline with the standard units (can literally hear it if you know what you are listening for). Hopefully the HFC's will free this up.
for emission laws etc.. this vary's from country to country and state to state.. you can get the specs of the units from the companies who produce the HFC's.
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