Sounds good. I try not to get too excited...I've messed up pretty bad that way in business. Cost me lots of money. Keep your guard up and good luck.
He punched his original muffler out a bit. Any muffler mod will require retuning the carburetor. You can buy the better, old-style, muffler for the 1127 series saws. Not quite as good as what ChvyMan did but should be close. http://www.weedeaterman.com/product_p/h90029.htm ChvyMan's Thread about his Farm Boss muffler mod.
Yes follow the link that MasterMech posted. I updated a picture of the enlarged holes. I thought I had one posted but I guess not.