Compression Ignition Addict
Join Date: Oct 2007
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It is a fuel pressure box, like the IDP Torq 2.2.
It raises your fuel rail pressure beyond the truck manufacturer's specifications.
There has been concern about premature wear on the truck's injectors (with extended use) due to the increased pressure but it hasn't been verified.
Since it doesn't reprogram or modify your truck's computer (ECM) it can be removed and no one will ever know.
I ran the Torq 2.2 and could tell that it added a little extra power. Fuel economy was "minimally" improved. I say this because my mpg's were better than stock but my truck regenerated more, which hurt my mileage.
I believe Dura Mileage offers a Money-Back Gurantee, so you might as well give it a try.