sledneck22
TY 4 Stroke Junkie
Does anyone have any experience fabbing their own muffler? The way my turbo ended up laying I have it straight piped out the back. I was hoping it was going to be a little quieter than it is but I'm afraid trail riding it is going to create a ruckus.
I was thinking of buying some muffler pack for a street bike pipe, welding some smaller diameter perf stainless, and inserting into my exhaust pipe. Then have a collar that inserts into the back of the pipe and is machine screwed on. Here is a pic of what the pipe looks like now. Does that sound like it will quiet it down enough to function or a waste of time and energy.
Thanks,
Kyle
I was thinking of buying some muffler pack for a street bike pipe, welding some smaller diameter perf stainless, and inserting into my exhaust pipe. Then have a collar that inserts into the back of the pipe and is machine screwed on. Here is a pic of what the pipe looks like now. Does that sound like it will quiet it down enough to function or a waste of time and energy.
Thanks,
Kyle
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FLYBYU
VIP Member
Here's what I did. I used a 2.5" glass back that has some good baffles in it. Sleds nice and quiet but you can still hear the turbo.
Here is a video of it in the garage everything is louder in the garage so keep that in mind.
Here is a video of it in the garage everything is louder in the garage so keep that in mind.
Omega_5
Extreme
Building a custom glasspack is a relatively easy process.
You really only need a small piece of stainless sheet, and a two pieces of tubing (obviously one smaller than the other). If you can find perforated stainless in your area, it makes life a lot easier, instead of drilling the smaller tube. The sound will depend on the amount of packing, so a larger and longer outer tube is better, if you can fit it.
The one I built is very short; 12" long. The tube was 2" for the inside, to mate up to the existing pipe. The outside tube was 2.5". It's not a lot of packing, but it still cut the sound down. I'd put it half way between an aftermarket pipe, and a straight pipe.
If your muffler is going on a turbo, probably size the inside up to about 2.5".
It's a good idea to invest in a diamond hole saw kit, to aid in cutting the end caps. You'll burn out a conventional hole saw in a matter of seconds. Cobalt drill bits are a good idea as well, for the same reason. Titanium bits burn out fast. Keep in mind; slow speed. If you run a drill at high speed, it will heat the surface of the material, and case harden the area you are trying to drill.
As far as welding goes.
Avoid mild filler rod, if you are tig welding. ER70S-2 will stress crack in exhaust applications. I'd recommend ER304L. Get a larger gas cup, or switch up to a gas lens. It will net you a better quality weld. Argon purging isn't really required for building a muffler, however it will make the inside far cleaner.
You really only need a small piece of stainless sheet, and a two pieces of tubing (obviously one smaller than the other). If you can find perforated stainless in your area, it makes life a lot easier, instead of drilling the smaller tube. The sound will depend on the amount of packing, so a larger and longer outer tube is better, if you can fit it.
The one I built is very short; 12" long. The tube was 2" for the inside, to mate up to the existing pipe. The outside tube was 2.5". It's not a lot of packing, but it still cut the sound down. I'd put it half way between an aftermarket pipe, and a straight pipe.
If your muffler is going on a turbo, probably size the inside up to about 2.5".
It's a good idea to invest in a diamond hole saw kit, to aid in cutting the end caps. You'll burn out a conventional hole saw in a matter of seconds. Cobalt drill bits are a good idea as well, for the same reason. Titanium bits burn out fast. Keep in mind; slow speed. If you run a drill at high speed, it will heat the surface of the material, and case harden the area you are trying to drill.
As far as welding goes.
Avoid mild filler rod, if you are tig welding. ER70S-2 will stress crack in exhaust applications. I'd recommend ER304L. Get a larger gas cup, or switch up to a gas lens. It will net you a better quality weld. Argon purging isn't really required for building a muffler, however it will make the inside far cleaner.
sledneck22
TY 4 Stroke Junkie
Welding, packing, fabbing, shouldn't be an issue.
I just don't want to build something only to be disappointed that it didn't knock down the sound dB more.
I guess with mine being about 15" long and packing the entire length, I should get a little closer to aftermarket dB range.
I was kind of hoping someone would have a trick or tip on welding some kind of baffle here or there that would help more significantly than not. I'm just thinking if I can build a muffler for half the price of an aftermarket bike pipe... I might just as well.
I just don't want to build something only to be disappointed that it didn't knock down the sound dB more.
I guess with mine being about 15" long and packing the entire length, I should get a little closer to aftermarket dB range.
I was kind of hoping someone would have a trick or tip on welding some kind of baffle here or there that would help more significantly than not. I'm just thinking if I can build a muffler for half the price of an aftermarket bike pipe... I might just as well.
Omega_5
Extreme
Even the smallest bit of muffler will quite it down a fair bit.
If you're looking for a quick and dirty way of making it quieter, there is always the washer trick. It's not as great for performance as a glasspack, but it will make t way quieter.
Basically, you just take a piece of exhaust pipe and make a few marks every 6". Drill 4 holes at each mark (90* from each other). Go get a few very large washers from the bolt store, that match the ID of the pipe (grind them down if needed). Use a magnet to line them up to the drilled holes, and plug weld them from the outside.
The washers will break the exhaust stream, causing it to baffle on itself.
Again, a very ratty trick, but it works in a pinch. And it's always better than losing your hearing.
If you're looking for a quick and dirty way of making it quieter, there is always the washer trick. It's not as great for performance as a glasspack, but it will make t way quieter.
Basically, you just take a piece of exhaust pipe and make a few marks every 6". Drill 4 holes at each mark (90* from each other). Go get a few very large washers from the bolt store, that match the ID of the pipe (grind them down if needed). Use a magnet to line them up to the drilled holes, and plug weld them from the outside.
The washers will break the exhaust stream, causing it to baffle on itself.
Again, a very ratty trick, but it works in a pinch. And it's always better than losing your hearing.
