been looking at 2008 1ton 4x4 dually . ive had 2001 5. 9 for 10 years now but need a 4 wd . why are there no programmers for 6. 7 banks dont even offer exhaust for it why cant you take all that mess off the exhaust that has to be restrictive . they tell me check engine light will come on . dont they have something to fool computer . what is best cold air for this truck does anyone offer exhaust programming any help would be appreciated