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I am sure. Once the engine heats up, nice and toasty at about 250 degrees F, the dual cone results will suffer greatly. I have no doubt that while the motor is cooler that the dual cones will produce more power because they will suck in more air. So, make sure you race people before the car has warmed up to its normal operating temp. and let her rip. They do sound good with all of that air being sucked in to the cones.
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