Now we need to drill the hole that will hold the Fullsac baffles in place. This is easy, but you need to take your time. The pipe is hard and round. A drill bit will walk down the pipe and scratch the H#|| out of it if you are not careful.
Step one here is to measure in from the bottom of the pipe 1 3/8" from the edge. The bottom of the pipe is directly opposite of the nuts that hold it on the bike. Don't drill on the wrong side! Measure twice cut once as they say
Step two is to use a center punch and punch the mark where you want to drill. Do NOT skip this step. A drill bit will not bite into the pipe if it isn't punched! If you don't have a center punch use a metal screw with a hard point.
Step three is to start with a small drill bit and then work your way up to a 1/4" drill bit. Take it easy and do not jump sizes too quickly. The more bits you use the easier the hole will be to drill. If you have a drill press use it. If not, just be careful. I used a standard battery powered drill with no problem.