I have a 2008 Dodge Ram 1500 SXT 5.7 . I want to install new long tube headers and was wondering if 2007 headers will fit on a 2008

 

Should be fine, but it wouldn't hurt to place a call to the manufacturer. I've talked to (bugged) more than one manufacturer before doing a mod over the years. Many will put you straight through to an engineer who actually knows the product...

 

They should fit fine. The 07 has a front resonator and the 08 does not. This doesn't really matter since you will have to fabricate a new Y-pipe anyway.