I've raced just about all the intakes your all talking about. First it's a little unfair to compare intakes in this way. Nothing works like a good combo. Just what combo is best takes a lot of testing and tuning. Some intakes may work better with a particular cam and heads, while others not at all. Yes duel and open plenums are different in the torque ranges, but so too are intake configurations. Manufactures want you to buy their products, so they all say they make the best. The magazine findings help a little, but like so many on her have said, "it's all about the bucks". Best way is to go out to the track and talk to some of the people that do this all day during the test and tune times at the track. They're a wealth of knowledge. Good luck.
