muffler delete?

ben henderson /
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On my tomos it has a biturbo pipe welded to the stock header.

I know that the expansion chamber (the part that says biturbo on it) is important for a 2 stroke to run well. But is the muffler after the expansion chamber needed? will removing it help/hurt performance? I'm not so much thinking of not running any muffler as perhaps putting on one that would allow more flow and raise the noise a bit.

0122192139a_Film4.jpg
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