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Nope you will lose low end power, better off using 2.25 or 2.5" unless going to turbo the beast then you want 3"
 

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You'll lose some low end grunt even with a header. I went from 2.5 to 3" exhuast on my 6M and lost a little grunt from down low. The only reason I went with 3" is my plans to use it with a turbo in the future.
 
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