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Old 02-26-2012, 03:29 AM   #7 (permalink)
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Ladogaboy - '11 Mitsubishi Lancer EVO GSR
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Originally Posted by oil pan 4 View Post
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.
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.
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