Ive been told that the Navigator is basically the exact same layout as the blackwood. My question is that would an exhaust system fit on the blackwood that was designed for a Navigator, and if so, can anyone recommend a good fuel efficient muffler/system? So far Ive only been looking at flowmaster.

Flowmasters are the best! I like Blackwoods. They are one of the hottest looking trucks. (I think) The bed sets them apart. I think to many people wouldn't buy them bcoz they were afraid to look that damn good!

Flowmaster mufflers have o be the absolute worst sounding muffler on a mod motor I have ever heard. IMHO they belong no where near these engines. I have seen nothing on the dyno either. We have a KILLER system for the Nav's give me an email or a ring.