The only Macs header I had for a .40 size engine was 5 inches long. I had about 2 inches into the can.

JB weld epoxy holds the stinger in place. I tried using Aluminum solder but my first try melted the stinger. So I just epoxy'd it in.

I also didn't mention that the larger White rain muffler only weighs 1 oz more than the stock muffler.

larry