Description
YS91SR 3C · YS91ST · OS91HZ · OS91SZ
Corresponding models: 90 helicopters all models for F3C ( 3D helicopter (T-REX700 etc.) is not allowed)
It is a muffler of no semi-tuned type and it contains 3D element coresponding to F3C new pattern.
Measures of sound: changed to a mild sound compared with the previous work.
Made for orders
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