No Backpressure in Exhaust systems is good,

In doing some googling , I found some information on this subject .

They say that you want no backpressure as this will effect engine power .

There are certain mufflers that can reduce backpressure.

No muffler will completely reduce backpressure .

Look at the exhaust system on the Nascar race cars , they have crossover pipes that come down to huge tail pipes and zero mufflers and no backpressure which is what they want .


http://auto.howstuffworks.com/muffler5.htm

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