MS440 Dual port muffler cover

[MNfarmer]

I've put an early muffler on my 440 with the larger exhaust opening, would a dual port cover help any or is the larger opening enough? I just use it for firewood cutting and rarely do I put a larger bar than a 20" on it.

 

[cuinrearview]

Yes

 

[MNfarmer]

Thanks!