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Might sound nuts, but try taking off the antenna or replacing with stock. I know of someone who have a thump above 60mph.The mechanic tried to figure it out for a week. Turns out the tennis ball he put on the antenna was hitting the body and creating a thump.

Quick update, installed AMS tubes and whipple intercooler on the street, plus a Duramax tune. Boy what a difference. Any ideas what else I can do to squeeze power without getting radical?

Thanks for the info Ray. Ali that's kind of you, where ya from? I have decided to install them myself.

Afternoon rayofsi. I noticed you are in NYC, I'm new to moding my truck. Do you know any shops with experience installing intercoolers in the city? Thanks in advance.

Great info. I am looking for a good deal on a Whipple IC for my 2020 raptor.