Yeah, I've got Injen long tube CAI's. The long tube CAI's like Injen, Stillen Gen3, and AAM, are great because they bring colder air from outside the engine compartment for better air/fuel mixture, and they're less sound-restrictive so they sound awesome at higher revs.
Short rams are ok, but they still feed the engine pretty hot air.
Drop in filters are less restrictive filters, so that more air gets into the engine, but they give you less power than CAI's and don't improve the sound on their own. However, it's a lot easier to drop in a filter now and then than it is to remove the front bumper to replace the air filters on long tube intakes.
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