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I had my muffler installed today with a custom rear section. Here is a pic. Will the increased back pressure mess anything up the way that I have it set. Thanks. I can close off those 2 holes on the sides if I want. Thanks.

 
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2.25" custom piping?

 
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no its just rear section

 
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it's a custom rear section. from the resonator back.

 
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I don't think you'll get more back pressure unless you set it even quieter than stock. You can remove that entire silencer can't you?

What kind of muffler is it and where did you get it?

 
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It's a powertech B3. I can remove the silencer or just rotate it to close the two openings on the sides of the main pipe.