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That would work just the dirt that gets through the K&N filter would be a concern. If just a street truck it would be fine but I would bet most use them in dirt and the dirt getting through would take its toll on the engine.

Pulling off the mushroom cap can make it worse it will act like blowing a cross the top of a straw and watch the liquid come up the straw. In drag racing I have watched people put forward facing scoops and the car falls on its face do to wrong location and or wrong designed air pan

Also something else we have found some of the air minds have very weak springs so from one to the next they will read different

We did some testing with k&n they did let a little more air in but a lot more dirt got through and not hurting the engine is our first concerne that is why we went with the filter we did but we are trying a different brand I don't think it will be any big change tho. The ram air scoop will move...

Hey guys have you tried removing the mushroom cap in a lot of cases we have found them to be a big problem,one thing we see a lot is it pushed down so far that it cuts air off from reaching the engine as fast as it should but we really need to get your feed back on stuff like this so we can see...

Hey guys if this help you save some time we sell these air cleaner kits to make your life easier it is a drop in kit no modes http://www.steelsoldiers.com/showthread.php?143239-CUSTOM-AIR-CLEANER-KITS-for-the-m939-trucks&p=1752815#post1752815