Doma exhaust

pollo · Aug 25, 2016

There are 7 new (out of box) Doma Racing titanium 0360 slip ons for $109 plus $10 shipping on Ebay motors. There may not be mounting brackets.
I just bought one for my 550 and have already fitted one similar to it on my 650.
Seems like a good price even if you need to get sone brackets.
I can provide the link later if you dont see them.
Also interesting is the Doma logo on the left side.

pollo

pollo · Aug 25, 2016

Here's the link.

DOMA Racing 0360 Ultralight Weight Titanium Muffler | eBay

tony951 · Aug 26, 2016

Thanks for posting that link, Pollo! I did a little research and saw that some reviews stated that low end was a little softer than stock, but mid-range and top-end were great.

Do you happen to know:

1. Does the 0360 have a spark arrestor? If not, easy to add?
2. Any mounting challenges on the FE550 (I have an '05)
3. I have a 98 dB limit - is the Doma loud?
4. How did your FE550 respond to the muffler? Power? Any jetting changes needed?

Thanks!

Tony

pollo · Aug 26, 2016

tony951 said:
Thanks for posting that link, Pollo! I did a little research and saw that some reviews stated that low end was a little softer than stock, but mid-range and top-end were great.

Do you happen to know:

1. Does the 0360 have a spark arrestor? If not, easy to add?
2. Any mounting challenges on the FE550 (I have an '05)
3. I have a 98 dB limit - is the Doma loud?
4. How did your FE550 respond to the muffler? Power? Any jetting changes needed?

Thanks!

Tony

I haven't recieved it yet but will post when I do.
It appears to have the smaller opening enduro end cap but not sure about a spark arrestor yet. I have added a few in my time though.
And im not sure about mounting brackets yet but I have also made custom brackets before. Or even buy sone from another slip on.
I currently have one of similar dimensions on my Fs650 that has the larger end cap opening for street use. It is loud and makes it run a little leaner but no jetting changes.Its not a huge improvement from stock but does feels like a little more power everywhere on the 650.

pollo · Aug 30, 2016

I got the Doma 0360 today. It is new and as you see in the pics it does have a small dimple or 2 from being bumped around but that's all.
There are no brackets as I thought and would need to make some. Size and dimensions will fit though. I thought the end cap opening would be bigger, as you see it smaller than the stock opening. The stock is 1 1/4 while the Doma is just 7/8. I don't know how that will translate into performance until I try it but it is probably not that loud and may not need any jetting changes. A zip tie put down in the opening stops around 6 inches in like it has a spark arrestor which is good. I also have a pic next to the KTM500 stock cap and it must not be as restricted as that one.
Anyway, I have not ridden the 550 off road yet and it will be with the stock exhaust first.
I also have a spare stock slip on that I compared weight to and the Doma feels quite a bit lighter. Probably a few pounds.
The Doma will have to be an experiment when I get around to making some brackets.
I have also made some stock end cap mods on the extra slip on in the past. Not sure if I would end up trying that with the Doma to make the opening larger. The cap is riveted on there.

pollo

pollo · Aug 30, 2016

With further inspection the Doma does not have that bulky propeller inside it like the stock exhaust has.
But a clean straight shot to a smaller exit.
And it does have a curved exit as the stock one has.

I also found my Akrapovic spark arrestor 1 1/4" screw in insert.
This might be the perfect solution. Cut, burr and fit in the Akra insert to the Doma.
Project pics later.

VOR165 · Aug 31, 2016

What size is the inlet? 2"?

pollo · Aug 31, 2016

VOR165 said:
What size is the inlet? 2"?

Yes the inlets fine. Something like 2". Its the same as stock size.

pollo · Aug 31, 2016

I grinded off the rivets and popped the cap off. As you can see no spark arrestor and the exit tube looks tiny. So I had an extra oem cap with a shortened tube that I clamped and JB welded a spark arrester screen on then added some metal tape as the cap is a loose fit on the top and bottom. Side to side fit is nice and snug. I believe it will work. I plan on riveting it on and using High temp silicone to fill the 1/8 inch gap on top and bottom.

pollo · Sep 1, 2016

Here it is . Titanium Doma slip on with a Husaberg end cap.

pollo · Sep 24, 2016

I installed the Doma today. The bike breaths better.
I will test soon.

Taffy · Sep 25, 2016

If it helps Pollo, I dyno's a standard FE exit (25mm or 1") against the FC exit (32mm or 1 1/4") on my lil fully tuned 400 and there was 1bhp all the way from the bottom to the top and no difference in DB at all.

regards

Taffy

pollo · Sep 25, 2016

Taffy said:
If it helps Pollo, I dyno's a standard FE exit (25mm or 1") against the FC exit (32mm or 1 1/4") on my lil fully tuned 400 and there was 1bhp all the way from the bottom to the top and no difference in DB at all.

regards

Taffy

Thanks, It is a standard 1 1/4 inch FE endcap from the 550. (Seems close to 1 1/4). The endcap was 7/8 on the Doma can.
The exhaust does seem to make it through the Doma a little easier the way it is routed inside. And the can is lighter and sounds cool.
Looks cool too

So whether it ads more HP, maybe not too much , but for $109 at titanium silencer was worth it for the added bling.

pollo

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