I systematically have applied many of the bolt on mods with reasonable success. I believe they are a requirement for a solid foundation. But I also don't think the 2500 responds as well as a 1500 to each individual mod or the group of mods.
Plus, I am at 6000' and that adds a performance challenge as well. Suckn air at 6000' to 12,000' is a whole lotta work, I keep that throttlebody wide f open too, just to make sure there is no restriction in flow. LoL
Anyway, I run 35s and in a effort to move to 37s I regeared to 5.13 from the factory 4.10 and I tell ya what, from 0 to 3500 rpm she went from $55k brick to screamn beast. I paid the premium dollar for the swap, living in CO, but I'd do it again in heartbeat. ($2700 parts and labor)
I was targetting a 4.88 ratio but my axle shop told me AAM makes an oem gear set at 5.13 and not at 4.88, so I choose the 5.13 and figured if too low I will just get a slightly bigger metric sized tire.
Well, I can't seem to take my 35s off my truck because I love the way it runs now and I have plenty of Interstate travel around here with ftard high speed traffic, like 85plus just to merge on, and I'm not too low for that business either.
My tires are now at 6/32 tread depth so I gotta do my move to 37" but you will love a gear swap, 4.88 or 5.13.
Her and I are lifers. Right now she has 65k on the clock, running better than ever. I have part numbers for the OEM gear sets, somewhere.
Good luck, keep us posted.
I guess I should answer your post: I went with ARH headers with high flow cats. ArH is a beautiful product and they supplied me with stainless steel tubing all the way back to the muffler. All hangers in the correct spot and fitment couldn't be better. Do they perform better than any other long tube, eeh, I doubt it. But I would buy them again. Only improvement they could do is offer a ceramic coating option and they do not. I had to do that after receiving them. God they sound great running through the solo muffler, through anything probably.
2016 RAM 2500 Puthie Wagon | 392ci w 6spd | CAI w ARH long tubes & MF | Diablo T2 w HF tune | 5.13 AAM w 35" Mickey MTs | Custom Graphics w illegal tint | Dodge Off-Road