I'd really like to find out what can be done to the new 08 superduty's without voiding their warranty. my father is a salesman at a local dealer and has already told me that there are very few things that can be done to them. but i'd really like to get some gains out of it.
a friend of mine has the dodge diesel with 4" exhuast and K&N intake, and he just hammers the new superduty's.. i'd like to fix that up but still keep my warranty? suggestions?