TEST IT! Give it a go, it'll be fun. I'd test without the muffler, then go with the washer with a relatively small hole and slowly drill it larger as you test to tune it.
On a side note I replaced the muffler on the TDI with a straight pipe when the muffler broke off. It did not make a noise difference at all. But then again the turbine itself makes a pretty good job at muffling already.
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