[spyderwerks]

Ive used several of these exhausts over the past 8 years. The first design was created by Jim Constance of MI. I had Jim make one up for my 58 Speedster in mild steel, back then the price was around $900.00 The Speedster was running a stock 62 S90 engine and this system needed some added back pressure to gain optimum performance. The system came with a flat steel plate you could affix to the end of the Stinger but this wasn't the best solution. I found that I could tune each engine by experimenting with varying back pressure created by my self made bung. Heres what I came up with. I went to the local Hardware and got some alum. mesh. Its sold in sheets. This is the heavier gauge stuff. I then cut out a section with tin snips , approx letter size. I then rolled the mesh so it would fit tightly inside the tail section (stinger) of muffler. I then fab'd. a piece of 16g flat steel that I affixed to both ends of mesh bung. Here you can get creative and drill holes in the flat stock to create the desired back pressure. I ended up with one oval hole at each end which approximated the shape of the stinger . This bung is oval in shape and the metal ends are drilled around the edges 1/16 holes and wired to the bung.Once the bung is inserted you have to come up with a solution to keep it in place. My solution was to create ears on the outer piece of flat stock (the one just wired to the bung) . Here I drilled through the outside edges of the stinger. inserted the bung marked the ears and removed & drilled same. Using a slightly larger stainless sheet metal screw and secure bung to stinger. This system worked to create the needed back pressure & served to really bring down the DBs. Its easy to remove if you want to play the loud pipe. Good luck & Have Fun