Home depot muffler extension and exhaust temp?

I ran the copper water heater hose for 5 or 6 months. It did reasonably well when you held the revs down. I've fabbed several variations of 'home made exhausts' over the years. Some of the pictures are in my album.

Good luck!!

(The 'rubber couplers in the SBP's kit are actually high temp silicone. There's a specialty hose place here that sells it for around $10 a foot.)

I have used both copper and stainless flexed tube meant for water, but if bumped a bit too often, the heat and vibration cracked at tight bends.

There is the rubber gasket and also a nylon (non-conductive) sleeve at the coupler thread ends. I removed both, and made copper donut rings that added up enough thickness to replace the rubber gasket. The non-conductive nylon sleeve is there to prevent galvanomic corrosion in dissimilar metals in water piping. You don't need it so its tossed.

I finally just went massive cast iron water pipe. No cracks or leaks and have been off roading the bike with it and its been tested to know it holds. The weight is a lot I know.

MT

I think that while the corrugated pipe may be convenient for plumbing the exhaust to the back of the bike, it might really dampen any pulse/wave effects going on. For that reason it may be better as a muffler than a resonant pipe. Just a thought.

Steve

You can get high temp silicone through model airplane supply/hobby shops. It's not too $$$.
Don't get carried away with the length, it will cut down your top end, mess with your carb settings and increase engine heat.

FYI, I don't believe high-temp silicone tubing is oil/gas resistant...thus, ok to wrap around a pipe for stabilizing and/or connecting, but the inside (if exposed to oil/fuel) will deteriorate over time...not sure how long it will take...perhaps months/years? But pretty sure it's not a maintenance free solution for long-term. Replacing them as needed is likely necessary.