Thanks for the explanation mustang 67408. As a follow up, I recently put a Magnaflow muffler on (no other mods). I drove the truck for about 100 miles before resetting the ECU. I could swear that my truck pulled harder at full throttle after the reset. If in fact the truck does perform better after the reset, does this mean that the default settings are providing more power than my learned settings? Will my settings eventually adjust back to the "pre-reset" settings anyway? If so, after how many miles will this occur? Thanks in advance for any replies.
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