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Originally Posted by FedXr
I just used the 3M rattle can undercoating. You can buy the brand name herculiner stuff and that would work also, but more $. It took about 2 cans to do. It was originally the polished finish, but I sanded it and the box before coating, PITA. Since posting I have gone on a 600 mile road trip and have noticed gain going from originally 16mpg to now 18. That is not the reason I got the AEM, but a welcomed benefit. I also have a magnaflow. I will see on the way home if I get the same mpg or if it was a freak thing. Thanks for the comments!
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Maybe so, I got about a 1mpg increase when I added my fram boost intake, when it was my only mod.