Air filter connection modification - BGM Pro Lambretta LI (series 1-3),LIS,SX,TV (series 1-3),DL,GP unpainted

Part of the bgm PRO air filter box (Art. No. BGM4488) modification. The part manufactured in Germany can be used for the modification of original air filter boxes for higher air flow rate.

The diameter of the weld-in piece corresponds to that of the hole in the frame.
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