been pondering getting a set of under drives for my 4.6l motor.. i already have the gotts mod, k&n filter, electric fans and a polished throttle body.. but i just want more power and some shiney stuff under the hood... worth it?

 

Well summit sells the BBK kit for $170, and they're supposed to free up 8-15hp. So they cost less than a CAI and they give about the same benefit. I'd say that's worth it. Oh and they look good because they're polished.

 

I would say a programmer would be your next best complement to what you already have. IMO under drives give some small gains, but not enough to be ahead of a programmer. They were a last item to squeak a little extra power after all the mods on my old truck.