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A couple of facts: If you end up replacing your intake with a cold air kit you will most likely end up with a louder engine under the hood. Those mufflers or sound boxes are there for exactly that. To quiet the noise created when you put the pedal to the metal. Those boxes are of a certain size, shape, length and are designed to cancel out unwanted harmonics created by each intake valve opeing and closing. The less noise there is, the more undisturbed is the air flow that is being sucked into the engine. The idea is to strike a balance between power, noise, and fuel economy. The reason why intake kits give you more power is most of the time the power curve of the engine is modified in a narrow area. The rest of the power band remains steady or might even drop. I suggest if you really want cut and dried answers to your question, read The Scientific Design of Intake and Exhaust Systems by Phillip H. Smith.
This book has more than enough information to help you make a more informed decision. Best of all it's probably down at your local library for free. -Chris
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