My kid will be looking for a truck in the near future i have had a 7.3 and now own a 6.7 but my kid doesn't have the money for a 6.7 and doesn't want to go to the old 7.3. My question is. the majority of the 6.4's out there run 10 thousand or more above the cost of the 6 litres, is it worrth this or can one find a reliable 6 litre? What modifications do i need to ensure a reletivly trouble free 6 litre? Thankx to all that reply.