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Discussion Starter · #1 · (Edited)
I changed the exhaust pipe recently on my Honda CBR250R with a Two Brothers carbon Fiber Black Series slip-on pipe. It cost nearly US$500.

Meanwhile, I had heard of other people complaining of Two Brothers Carbon Fiber pipes starting to turn yellow/brown after a while, but I didn't think much of it at the time.

After driving only about 1,200 kilometers on the bike with the new Two Brothers pipe installed, the carbon fiber started turning brown at the end where it connects to stainless steel section of the pipe as seen in the attached photos. In fact, the stainless steel section of the Two Brothers assembly also turned from silver to completely gold as you can see here too.

Before buying the pipe I had also read on the Two Brothers web site that after a period of use the pipe might need to be repacked to avoid the browning. Honestly, I have never seen this problem even occur with other brands like Yoshimura and others to begin with.

Anyway, I didn't expect my pipe to start having problems after such a short period of time or need to be repacked right away so I wrote to Two Brothers when the pipe started turning brown suggesting that the pipe might be defective.

Their response was:

"We do recomend customers to repack the muffler. Change in color of the muffler is a clear sign that the muffler must be repacked. Muffler durability is linked to driver's riding style and varies depending on many factors."

So I reiterated that I had only driven about 600 miles with the pipe installed before this started happening and again I thought it was defective. Their response again was:

"No defect. The packing material will be used as you use the muffler and it is pert of the maintenance to repack it as need it."

This tells me their pipes are very poor quality to begin with since I do not drive my bike hard or ride it in any way that is not recommended. And the fact that they are not willing to resume any responsibility at all after I paid a lot of money for the part, means their customer service is quite bad too.

At this point I am not going to bother to spend more money to repack it. It is already ruined anyway. The attached photos were taken about 2 months ago and the pipe has even more discoloration now. I will just leave it as is and eventually replace it with another brand and be finished with it.

Lesson learned not to buy Two Brothers ever again, full stop.
 

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Stainless Steel pipes turn gold. That's just what they do.
My BMW R100RS has a complete top quality SS system from front to back. All gold now.
 

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I've had my 2Bros exhaust for close to 4000k's and have had no problem with the carbon fiber changing color, although I do use Inox lubricant on it every time I wash the bike.(cheers to Aufitt for that tip)
Looks like yours wasn't packed properly in the first place, not enough packing down the burn end causing a hotspot.
I have also heard(though not sure if true)that a carbon s/o will overheat and burn if you run the engine for long period without the airflow to cool the can eg. dyno tuning.

To repack you drill out the pop rivets to remove end caps, repack and replace rivets.
 

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I changed the exhaust pipe recently on my Honda CBR250R with a Two Brothers carbon Fiber Black Series slip-on pipe. It cost nearly US$500.

Meanwhile, I had heard of other people complaining of Two Brothers Carbon Fiber pipes starting to turn yellow/brown after a while, but I didn't think much of it at the time.

After driving only about 1,200 kilometers on the bike with the new Two Brothers pipe installed, the carbon fiber started turning brown at the end where it connects to stainless steel section of the pipe as seen in the attached photos. In fact, the stainless steel section of the Two Brothers assembly also turned from silver to completely gold as you can see here too.

Before buying the pipe I had also read on the Two Brothers web site that after a period of use the pipe might need to be repacked to avoid the browning. Honestly, I have never seen this problem even occur with other brands like Yoshimura and others to begin with.

Anyway, I didn't expect my pipe to start having problems after such a short period of time or need to be repacked right away so I wrote to Two Brothers when the pipe started turning brown suggesting that the pipe might be defective.

Their response was:

"We do recomend customers to repack the muffler. Change in color of the muffler is a clear sign that the muffler must be repacked. Muffler durability is linked to driver's riding style and varies depending on many factors."

So I reiterated that I had only driven about 600 miles with the pipe installed before this started happening and again I thought it was defective. Their response again was:

"No defect. The packing material will be used as you use the muffler and it is pert of the maintenance to repack it as need it."

This tells me their pipes are very poor quality to begin with since I do not drive my bike hard or ride it in any way that is not recommended. And the fact that they are not willing to resume any responsibility at all after I paid a lot of money for the part, means their customer service is quite bad too.

At this point I am not going to bother to spend more money to repack it. It is already ruined anyway. The attached photos were taken about 2 months ago and the pipe has even more discoloration now. I will just leave it as is and eventually replace it with another brand and be finished with it.

Lesson learned not to buy Two Brothers ever again, full stop.
Thanks for the warning, bro. I'll never buy Two Brothers with that type of cus. service.
 

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My stainless pipe has turned a beautiful gold/purple colour.. means you are using it properly.

As for the tarnished printed carbon, yes repack it as its getting hotspots and that's where cheap companies like 2 brothers scrimp on packing.
I'm going to repack my Akra anyway.. its easy as long as you can drill stainless rivets.

A good check is to rev your bike and see where the outer shell 'pulses/flexes' with the beat of the engine.. it often shows a hollow spot meaning the packing is loose or non existent.
Dirtbike riders repack annually.
 

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the carbo can looks like exhaust might be escaping out the end cap fitment and discoloring. I have never seen discolored carbon fiber, but I have never seen that pattern either.

yoshi has repacking videos on their site. yoshi's need repacking too.
I really liked the stainless full systems that turn gold, they look like titanium after being heated.
 

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Discussion Starter · #13 · (Edited)
Akrapovic makes nice carbon fiber pipes. The one for the CBR250R looks really nice. You can have a gander on YouTube if you want:


Meanwhile there is a good chance I will just live with it. As long as the pipe keeps on working there is probably no point in throwing any more money at this bike for now. If it were a bigger, more expensive bike I might consider another pipe change, but I don't have enough invested in the bike to keep throwing $500 pipes at it.

Sadly though, seeing how awful the Two Brothers customer service is, and with them probably having so many regular complaints like mine with the QC on their pipes being so low, it seems like a dead end with them to try and get any warranty coverage whatsoever even though the pipe was probably not packed correctly from the factory. And, regardless of how I ride, this shouldn't happen so quickly on a pipe after only 1,200 km despite what their customer service staffer said. The fact that it did happen so soon after installing the pipe either means it is defective, has junk build quality, or both and has nothing to do with how I ride the bike.

As an aside, when I was over at the mechanics shop having the pipe installed a couple of months ago there was a guy there with a CBR 1,000 and he had a Two Brothers carbon fiber pipe on his bike already. He saw my pipe being put on my bike and he said he likes the sound of the pipe on his bike, but that his turned yellow and brown and he showed me his so that I was aware of the problem with Two Brothers pipes. I figured at the time he was either riding too hard or the pipe was just old and starting to wear out. Now I know it was probably neither of those issues. Just a bad quality pipe brand to begin with if it happens so easily and quickly on a bike like mine which is only a 1 cylinder engine.

I also did a quick Google search on "Two Brothers Exhaust Turning Brown" and I was surprised how many threads came up on other forums about it being a problem. One guy even wrote on the Motorcycle Superstore site how on his GSXR it started happening the first day he put the pipe on the bike!

I wish I had known about this problem before and I would have for sure bought another brand instead. And it's an even bigger slap in the face when the manufacturer tries to blame it on you for not repacking the pipe when the pipe was still practically brand new as the problem started developing. Seeing how Two Brothers tried to blame the problem on me to avoid having to take responsibility at all for giving warranty coverage just adds salt to the wound.

If I ever modify another bike though Two Brothers will never make the short list again. And frankly speaking, a garbage quality pipe and a garbage company from my experience whilst the pictures speak for themselves.
 

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Discussion Starter · #15 ·
The Akropovic pipe sounds so nice. I wish I had bought this one instead. Price is the same as the Two Brothers:

 

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Sorry that a change in color is bothering you so much but I wouldn't say it is because of bad quality or faulty packing. Exhausts are hot and change color. The Carbon that TwoBros is using is very light and has minimal paint or varnish on it because that doesn't make it work any better. Next time you see some bikes with different exhausts, take a look to see how many of those cans still look like new.
 

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Discussion Starter · #17 · (Edited)
Thanks Sendler. I have actually seen a lot of other Carbon pipes. Yoshi, etc and I can't say I have seen any others that have the problem mine does.

I didn't want to burst killstrelok's bubble about his pipe and the photo he put up saying that his has 4,000 KM on it and no discoloration, but actually when I look at his picture it does look like it is yellowing to me a bit.

But with his pipe the yellowing is more uniform throughout the pipe. With mine it is also starting to happen to the rest of the pipe now in the same way his has yellowed a bit, but what bother's me are those heavy blotches of discoloration at the end of the pipe on mine. That I would say is not normal. In fact, I have seen carbon fiber pipes on big 1,000cc Yamaha R1 and Ducati sport bikes and the like where the pipes are under the back seat where they are easily visible and I didn't see those pipes changing color at all. And those bikes probably get a lot hotter. The whole beauty of carbon fiber is that it is supposed to be able to displace heat so well and as a result not discolor.
 

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Discussion Starter · #19 · (Edited)
Me too.


Hopefully you'll email them a copy of this thread.
Thanks Redline. As a testimony to how bad the Two Brother's customer service actually is, see if you can even find an email address for them anywhere online in order to write to them and please let me know the results of your search. Sadly, I know you wont be able to find one because there isn't a customer service email address for them anywhere that even exists. They have a very elaborate web site, but no online contact facility. And if for example you write to [email protected] in the off chance they even have a general contact email box then the mail just bounces back as undeliverable. This says something about the company too in my opinion. Ya live and learn bro and sadly I am afraid I learned this one the hard way.
 

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You are correct marcbkk, my pipe doesnt look like it did new, but as you said is a more uniform discoloration caused by UV exposure as much as heat I expect(this is no surprise though) . Your pipe should have been replaced by 2Bros as it is obviously a manufacture defect.
As already posted, once the color becomes annoying to me it will be out with the heat proof paint and spray it black.
I also will not buy 2Bros again, as there are better options available now.
 
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