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If I put a MBRP® - Utility Black Muffler on my 2001 Polaris magnum 325 will I need to tune my engine?
 

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Probably not - changing the exhaust mostly only affects top end performance if it is a low restriction exhaust - a utility exhaust is primarily designed as a stock replacement exhaust and changes to performance will be minimal. Changes to the intake affect carburation more dramatically than changes to the exhaust.
 
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