doing some reading

[garyfink]

last night I had some time to browse thru some of the posts on here and I came across a very interesting one. According to the post, in 2002 and above there were changes made to quiet the engine noise in the cab. Was this just an insulation thing or were there upgrades to the injectors, idm etc. to accomplish this ? Reason I'm asking is I have an early 99 and I'm getting ready to pull the trigger on upgrading from the 110v to the 220v idm. I am told that even though the idm's may have different factory numbers all the 99.5-2003 are the same.

also has anyone used autocomputerexchange ?

thanks everyone for all the help