HDRIDR
New Member
So after researching several aftermarket slip-on exhausts for my nc700, I would love to acquire the GPR Deep tone Carbon. One problem $$$$$$. So I went with the poor man's alternative drill out my stock muffler. Pulled the muffler off the bike. Took a 12 inch long drill bit 1/2 inch size and drilled out about 5 holes in the baffle in a circular pattern. Then took a breaker bar about the same length with a hammer and punched out the center of it. Sounds a little bit better, but not a big change. I then switched out to a shorter drill bit and 1/4 inch in diameter. With a punch and a hammer went all the way around the end cap with about a half inch of space between each dimple made. I drilled were the dimple was made. Drill through the end cap and the metal wall about a 1/4 inch in from the end cap. Did two rows of these in an offset design kind of resembling a honey comb. Sand it down and painted the end cap in a flat black header thermal paint. Looks nice and sounds amazing compared to the stock sound. It's a nice deep tone similar to like a Ducati. I will post a picture and video once I'm home. 
