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I cannot tell by the acceleration(of course added more metal is hevier that stock) but the gas mileage is about same compared to before the bumper installed. And my D dont get good gas mileage anyway even though I am very easy on the throttle.
I vote for some more photos! Did these guys custom make these bumpers for you? I did not see any for our Durangos on their site.
I installed my Firestone air spring helpers last night, wife used the D to pull the horse trailer today, it was pretty much level with the trailer hooked up! I put 20 psi in each bag, she said it seemed to pull better too.
I dont think Iron Bull updated their website on the D bumper yet since I know they are really busy with alot more projects but if you call them and find out.
Here is a more pictures on my D