Blackbear did a dyno comparison, and best was airraid jr (mit with high flow filter) for about 9hp. The stock air box pulls cooler outside engine bay air so no need to change it. You will hear increased sound at WOT, but no drone at hwy speeds like an exhaust will get you. I felt a slight improvement in throttle response as well. I just did the MIT with Z71 filter since I prefer changing out filter vs cleaning one (dont know how you clean an oiless filter)...
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