| M421 |
Performance Exhaust for GY6-50/125/150CC scooter,with negative pressure on the out valve，size of Steel stainless muffler Ø110,L420 |
| M422 |
Performance Exhaust for GY6-50/125/150CC scooter,size of Steel stainless muffler Ø95,L315 |
| M424 |
Performance Exhaust for GY6-50/125/150CC scooter,with negative pressure on the out valve，size of Steel stainless muffler Ø98,L355 |
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