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Personally, id just get the hillpower bend, as it has the little bit of pipe that comes off and goes to some sensor.
As for cleaning the BMC, take it apart (its easy to do, just unscrew it all and the ends slide out). then just get some sort of brush and clean it, or an air compressor to blow it out.
I'm pretty sure it's 76.2 or 3" I.D. Get some good degreaser and lash your air filter with it until clean, dry it out thoroughly, then re-apply some air filter oil. Make sure it's not the red k&n type though.