Dale,

After reading your posts and doing some more research I am probably going to get the Zen 50. I will mate it with my OS FS-70 II and it should be a good combination.

I did look at the Kangke line but they were either too big or too small for the FS-70.

I haven't decided yet on whether to run the stock muffler or go for one of the Macs pipe products. I believe there is a channel down the centre of the plane to run the pipe. Is this correct?

How did balancing go with the OS 70?