Anyone have any recommendations for, or experience with, air filter upgrades? 
What's the major difference between the less expensive Red Rock or Rough Country ($150-175) versus the K&N or Flowmaster at $325?
		
		
	
	
		
	
				
			What's the major difference between the less expensive Red Rock or Rough Country ($150-175) versus the K&N or Flowmaster at $325?
	
	