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I would think so, because doesnt a muffler provide backpressure?
 

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ya, pipe damage can screw up a sled pretty bad, you have to have them provideing backpressure properly otherwise the sled won't run
 

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Right on the money guys.the engine is tuned to the exhaust,its set up to run with a certain amount of backpressure.it will run like crap.
 
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