Updating history New product Helicopter Tuned Muffler for 3D 60NS-3D　 This muffler is suitable tuned muffler for 3D flight, 2mm wider in diameter and 15mm longer in span comparing with #566, increased capacity to match 60 class engine. It is more silent, and easy handling for 55. 56 class engine as well. 　#2060 　　　　　　　　 　 　For　YS56SR YS60SR 　OS55HZ.HZ-R　Thunder Tiger56 engine Being sold now. Helicopter Tuned Muffler for 3D 105FS-3D　 This tuned muffler is 50mm in diameter, large capacity type, which is very effective in noise canceling and power making for 105 class engine. 　　　　　　　　#2105 105FS-3D　　　　　　 for OS105HZ. HZ-R 　 Helicopter Tuned Muffler for 3D 120FS-3D　 This tuned muffler has been designed and produced exclusively for the YS120SR. 　In the 13,000-16,000 rpm Maximum power is available. When the engine is set for 16,000-16,500 rpm during cyclic load conditions the engine will hold the intended rpm. #2123　 120FS-3D 　Applicable for YS120SR 　YS91SRS Engine Helicopter F3C-Mufflers for F3C 120FS-3C This muffler is designed and intended for F3C flight ONLY. #2124 　120FS-3C 　Applicable for YS120SR engine FreyaEX Sylphide Airskipper #2125　 120FS-3C　 Applicable for YS120SR engine T-REX 700