need help

[shortbed]

i have a 01 dually with the 7.3,and i tow a 35 ' fifth wheel i put a 4" downpipe,and run a 100 hp chip.an afe intake,gauges and a sonex valve in the tranny.i have 4.10's and the truck pulls the camper like its not hardly there. i get 18-20 on the highway empty,and 12-16 towing depending how hard i run it.the set up works for me,anything more would be asking for trouble.oh! i run a stock turbo..... for now.

 

[97 F350]

i cant go with a 4" bc i dont have enough room for it. its harder to find stuff for a 97 as it is for a 01. ya fule is 3.81 where i am at and i travel alot so i need to get all the milage i can get.