MarkV
Senior Member
- Joined
- Nov 24, 2014
- Posts
- 1,244
- Reaction score
- 520
- Location
- Ontario, Canada
- Ram Year
- 2003
- Engine
- 4.7 Magnum V8 NOW with Moose Power
Does a good cat back system help the fuel efficiency?? I have been looking into cat backs and some of the manufacturers say up to 2 mpg savings.... I realize it real world might not be that much but is there a notable difference??