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How much horsepower difference is there between an open exhaust, a cherry bomb type muffler, and a stock muffler?
There was a car show I saw once where they had a motor with race headers on a dyno. They wanted to see how much damage one could inflict to the headers by denting them and crushing them, before power was effected...
Very interesting data. They dented the headers to less than 50% of their normal diameter with no loss of power. Some were dented to less than 10% of normal diameter before any loss in power. Even with the headers damaged to the point of being almost completely restricted, power loss was less than 10%...
Trying to remember the name of the show, its on youtube. I think its called "Roadkill."
Google it, as it was fascinating...
There is very little power gain with a free flow muffler, assuming all else stays the same...
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