Originally Posted by moparfreak2
whatever i buy will stay stock. Except if i get the 8 it will get a flowmaster original 40. a friend had that setup back in highschool and it sounded sick. I would just rather stay in the above 20 range on the highway. i don't see that with an v8. I'm also going by the fact that the v8 will move the GC around easier especially on the beach.
You will have a hard time with over 20mpg either way unless you stay at 60-65 or under. That's when the mileage take a big hit because they are giant bricks. Both of these trucks are terrible with city driving and the more weight you pile into the 4.0 the worse it gets and it also has 0 balls on the highway for passing or on ramps. If you leave it stock but do all the motor exhaust bolt ons then it should help highway driving. You can get an SCT Hemifever tuner for the v8 which has 3 setting from economy to performance. The V8 responds well to those mods.
There is one guy on here that put a turbo on his 4.0 and it seems to be pretty quick.