Q1 Answer about the differences in mufflers

A1: About Sound (Compared to the original HM300)

• Initial model no-number muffler (lotus root) ⇒ Sound close to the HM300 of that time
• Later model no-number muffler (thick core) ⇒ Heavier bass than HM300 (Focused on the sound of that time)
• Genuine HM341 muffler ⇒ Quieter than the genuine HM300 due to noise regulations
  

A2: About the Deflector Pipe (Core)

• Initial model no-number muffler (lotus root) ⇒ Becomes a straight pipe when the deflector pipe is removed.
• Later model no-number muffler (thick core) ⇒ Contains the deflector pipe (thick core).
• Genuine HM300 muffler ⇒ Same structure as the later model, but the core is thinner.
• Genuine HM341 muffler ⇒ Different structure of the deflector pipe due to noise regulations. Therefore, the core cannot be swapped with the no-number muffler or HM300.
  

A3: About Sales Status

• Initial model no-number muffler (lotus root) ⇒ No longer available for sale
• Later model no-number muffler (thick core) ⇒ YAMIYA reissue currently for sale
• Genuine HM300 muffler ⇒ No longer available for sale
• Genuine HM341 muffler ⇒ No longer available for sale