ORIGINAL: Ernie Misner
Question: is the stack a tuned length, or just a length that looks good? The larger engines might need a little more length to contain the spitback. If it weren't for the horn on the end of the stack I would be tempted to clamp a piece of tubing onto the stack to make it a little longer and see how the test goes.
Ernie
Hi Ernie, Since the end is flared it might work to try a piece of copper tubing with a "flared end." I can't remember if I have a flaring tool or not.