quiet plug for muffler

I live on a large lot that backs up to a small patch of woods. I would like to build an arena cross track behind the house to ride from time to time .

I machined a plug with a 3/4'' opening and pressed it into the opening of the silencer on my 2010 yz 450.

It is now much quieter, more like a utility four wheeler.  Is there any danger of having too much backpressure?  I would hate to blow out a crank seal or head gasket.  Is there a better way to get the sound down to a level that the neighbors could live with?

Thank you for any help.

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