As to the best mod, I'd say that simply cutting out (or radically shortening) the smaller exit tube would be all that's necesssary to let the Stealth flow well. The long front perforated tube is about 1.125" diameter and the orifices through the bullet are reasonable. With this mod the end cap would "catch" the gas flow off the bullet.
Rear view of bullet:
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2011 EC250E
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