-The straight-through mufflers with packing (flow piping doesn't do 180* turn) flow the best.
-Turbo mufflers where the exhaust has to 180* and back again, are less efficient.
-Chambered mufflers vary a lot by manufacturer design. They rarely, if ever work as well as straight through. But comparing to turbo-style some are occasionally marginally better, many often worse.
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"The Mustang's front end is problematic... get yourself a Firebird." - Red Forman
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