Quote:
Originally Posted by oil pan 4
About the only application where adding larger pipe and muffler or removing the muffler is going to help will be a turbo diesel.
Turbos like as little back pressure as possible and diesel engines love having their cylinders stuffed with air mass even at light load.
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Elimination of back pressure has benefits in gas turbocharged engines as well, but top-end power is where this is primarily seen. In regards to fuel economy, I don't know of any proven effects either way.
I might, eventually, modify my exhaust, and if I do, I'll be sure to track any changes in FE.