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PMB quiet insert for '99 WR400

By MattF,
in WR400F/426F/450F

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MattF

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Anyone tried drilling out the holes in the endcap or cutting the tube on the PMB insert?

Looking to increase low to midrange while still keeping noise down. Please let me know of any (non)success stories before I end up with a $40 piece of scrap aluminum!

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