Poor dad gave son was a Debaffled YAMAHA BOLT exhaust instead of an expensive aftermarket muffler. 

How I did, Debaffled YAMAHA BOLT exhaust and Oil & Filter Change [CC]
0:04 Sound Before Debaffled exhaust
0:21 Locate Drain Plug
0:28 Remove the oil fill cap
0:59 Replace Oil Filter
1:20 Apply a thin layer of fresh oil to the rubber gasket of the new oil filter
1:37 Debaffled exhaust
4:01 Sound after Debaffled exhaust
It's sound better and loud little bit. Loud pipes saves lives. Peace!