Quiet t1 mufflers

[Martice]

Hi,
I need a quieeet mufler.If anyone can provied with some info on this it will be nice.
which muffler design is found to the quietest when used on a stock type-1 1600dp engine?
Is there a muffler that can be more quiet than the stock muffler?The shape, size, fitting, has no importance to me in this case.

[vujade]

What about dual quiet packs?

[Martice]

Are the quiet packs quieter that stock t1 mufflers? which is their internal design?