I just took one of my 30's to the post office and weighed it.

The engine weighs 9.1oz and the muff. is .6oz. OS has the weight wrong on their documentation which makes sense since the 30 is the same block as the 26, not the 40. I can't imagine why they would say the muffler weighs 2oz !!??!

The reason I bought the 30 is because I assumed the specs for the weight were wrong and I didn't want the extra 6oz. on my twinstar of a pair of 40's.

I'll have them mounted on my twinstar in the next few weeks and will start getting performance numbers.