Compared to stock, I love the sound of M50 pipes that have been debaffled and demickey'd. However, I've always thought they were a little loud when I accelerated hard and that there was a little bit of a high pitched sound mixed in with the deep growl. Some of that high pitched noise is valve noise and some is resonating from the mufflers themselves. I've wanted all that deep growl but get rid of those higher pitched noises. So after experimenting a lot, I found a low $$$ fix that tames the volume just right and makes for a better, deeper sound.
So, here's the tutorial:
1. Get a pack of fiberglass muffler packing used to repack sportbike mufflers. I got this pack for $6.50 at a local bike shop. The piece I got was about 14" x 12" and about 1" thick uncompressed in the bag.
2. Get a piece of masonry wire mesh (used for things like interior rock work around a fireplace, etc). A sheet is about 2'W x 8'L and has a tar paper backing. The wire mesh is pretty stiff and has a great springy action when rolled. I had some laying around. A sheet costs about $5 at Home Depot/Lowe's.
3. Cut two pieces of the wire mesh about 8" long and about 6" wide. I've experimented with several different sizes and lengths so I'm giving you the dimensions of what worked best.
4. Cut two pieces of fiberglass muffler packing about 8" long and about 6" wide.
5. Now find a spray paint can. (use blue paint because we all know that blue is always faster!) Now roll a piece of the wire mesh around the paint can. Be careful to roll it nicely and not force it and cause it to bend. We want to use the spring action that is inherent in a piece of nicely rolled wire mesh.
See the accompanying post for the rest of the steps...(just above or below this post, depending on how your posting time/dates are set)