Needs a-b-a to make that claim. Also need to see logs to see if fe was steadier than +_ 2% before. Otherwise, we know unless the exhaust system was really messed up to begin with, changes to it really don't amount to much fe wise, even though the added noise provides so much pleasure that it alone is worth it. Let's hope the next mod is to cut the stacks off at about driver's ear level, or better yet turn the pipes in towards the cab.
