Cheap big bore exhaust.

I'm always looking for a big exhaust to run on a big engine. Something that will quiet it down enough to ride in the hood when I'm testing a new engine, but big enough to let it breath.

So I looked around for a muffler that would fit the cheap Chinese header pipe. I chose this one. (It's available cheaper straight from china.)
https://www.ebay.com/itm/28mm-Black...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649


I was pretty impressed with it right out of the box. It's made of heavy gauge aluminum? and it's solid...no rattles or shakes. Mounted it on my 113cc 93 CT70 and it was loud, as expected. But it had a nice "tone", and if I put 1 finger behind the tailpipe it quieted it it noticably.
So then I drilled out the rivets on the exit end and opened it up.


Considered ordering a "DB killer" but didn't want to wait.
Considered making some elaborate silencer gadgets, but decided to start with one of the easiest ideas.
So here it is. It's loose inside so I can slide it end to end to find the best sound. Then I'll probably need to attach it somehow.


I'll post again after I try it out.

Probably is aluminum. The softer grades are inexpensive and easy to work with. It's not like a muffler is a highly-stressed mechanical component so, the worst that might happen is an easy dent that you could knock back out. It'll probably get hot, aluminum is an excellent heat conductor. Anyone recall the old Gianelli exhaust?; the muffler was similar size & shape. That one was a notorious leg-burner. Be mindful and it won't be problem, maybe fab a heat shield. This thing appears to be reasonably well constructed, they weren't too stingy with the packing and I like the look of the body clamp. More typically, a glorified hose clamp is used, albeit in polished stainless flavor. A lot of value for a $25 bill...

Good tip on that hot muffler. For my needs, right now, I could just use some header wrap and include the muffler.

I decided that I should have left the screen out until I'm done testing this pipe. Wanted to show a couple better pics anyway. I had a little more trouble knocking the end out of the muffler this time...lost a little paint. But again, I'm not concerned with how this thing looks right now. If it ends up being a nice, quiet exhaust, I'll buy a couple more to make pretty.

Header wrap will work. I kinda like the look, on the right machinery. As for the paint damage, what's a couple bucks worth of VHT...in the grand scheme of things?

Yeah, I wondered about that "spark arrestor" screen, too. Realistically, it doesn't do much...either way. As for getting the muffler quiet, without increasing backpressure, that's possible...within limits. What works against you is the short can. There's a reason why the mellower-sounding exhausts, including the high-dollar Yoshimura "tri-oval" are as physically large as they are.

I have one and OH YEA it's a leg burner. That muffler gets so hot you can cook a burger on it. I DO NOT like the way it's just a ''slip in fit'' with no springs to keep the muff secured to the pipe. The only thing holding it on to the pipe is that clamp. So yea, it wobbles a little. I wound up using a better clamp than it comes with. I see you drilled it and installed a screw to hold it. Good call. I tapped in a Harley ''drag pipe baffle'' and it toned it down for me till a bought a quality exhaust.