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Cold Air Intakes worthwhile
Some of the cold air intakes improve power by removing other restrictions in the intake piping. With a low restriction intake their is not that much difference between properly sized clean filters. So, you have to judge whether the lower restriction intake is worth the money. I don't run them on any of my vehicles, anymore.
I used K$N filters with a foam over filter on my trucks in Baja Mexico. They worked fine. They probably do flow more at first, but they actually filter better when they get some dirt buildup on them. I have gone back to paper filters, also. I think that I just prefer a filter that you can't see through and oiled filters are messy to service.
I run an oiled foam filter on my dirt bike and it is superior in dirt cleaning to the K$N from what I can tell.
Many new trucks pipe the air intake over into the fenderwell or have a cold air inlet anyway. As I said above, the aftermarket intakes claim to reduce the restrictions, but it is not all about filters and cold air.
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Cold Air Intakes worthwhile
One more thing...
Reducing intake and exhaust restriction makes an engine flow air more efficiently. So, it needs more fuel if you take advantage of the increased air flow. You pay for the improved performance potential up front, and then pay every day that you use that potential.
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Cold Air Intakes worthwhile
Intakes and exhausts on diesels seems to be particularly sensitive to restriction and efficiency. You can see significant gains with efficiency on a diesel and with the expense of fuel these days, it might be worth the money. Diesel fuel usage is related to power delivered by the engine (as with a gasoline engine) but with a gas engine, the increased airflow goes through a fuel metering device that is airflow sensitive with either fuel injection or with carburetion.
You should see a fuel efficiency increase on both engines as long as you don't start using more power. But, if you use that extra efficiency to deliver more power to the ground, then lower fuel milage will result even if an overall efficiency increase is seen. If the extra potential is used to push the driver back into the seat while taking off from stoplights, you might be delighted with the performance and disappointed with the fuel economy.
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08-04-2005, 13:26 
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