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Didn't want to highjack the "6637 vs afe" thread...
a have been using the 6637 filter for a while, After live tuning with DP, The 6637 kept activating the minder light when i would push the truck, Changed it to the AFE washable replacement from Clay, and wow what a difference..No more minder,more whistle, the truck is breathing much better...no questions here, just thought i would let everyone know..
Before someone asks, the 6637 with cover had less than 10000 miles, not dirty at all,also tried my spare new one..