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I'm not knowledgable of the specifics of '05's. I've got an '07 which is different apparently (I have a similar post right now asking about my '07). Factory airboxes are designed to a large degree to lessen or eliminate induction roar and resonances. To meet noise police requirements. In general, they tend to be more restrictive than they should be to meet these standards. The fact that factory systems are usually designed to bring in cool air from outside the engine compartment is good, but not the issue here. Detroit has been doing this since the early '70s, when underhood temps started going up. Reducing restriction is the true issue. When looking at my '07 I can clearly see definate points of restriction in comparison to the airbox on my mom's '09. Since her motor is rated at about 40 more hp, I'm betting this is part of the reason! I put an AiRaid oiled-gauze filter in mine already, and haven't noticed any difference in mileage or power. At least I don't have to replace it any more...
I think AFE makes a basic system for your vehicle.
 
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