Cheap and quiet aftermarket exhaust? - Honda CBR 300 Forum
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post #1 of 13 Old 09-26-2019, 01:49 PM Thread Starter
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Cheap and quiet aftermarket exhaust?

I bought the bike with Danmoto's Carbon GP whatever without a muffler and no original exhaust.

At first I liked the loud beefy sound but lately it has become an annoyance.

Checked for an offer on the original exhaust at a dealer and they asked for 790 euros .

Bought a fake Akra with a muffler shortly after but it's almost as loud as the Carbon GP.
Couldn't find any SH original exhausts and a new one seems way too expensive.
Anyone knows some chinese counterpart to the OEM one that is quiet or some way to quiet down (by a fair margin) the Carbon or fake Akra?

Last edited by Kreestijan; 09-26-2019 at 03:56 PM.
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post #2 of 13 Old 09-26-2019, 06:01 PM
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In the States, the OEM muffler or full exhaust would probably be yours for the taking. Just to clear the extra parts from someone's garage, since this is often the first thing to be modified. Just to be clear, are you talking about needing to replace the full exhaust from the head back?, and including the catalytic converter?, and muffler?? Or, just the muffler?? Because, after the "cat" is removed, you're talking a retune, controller, etc... Big difference in price. Or if it's already been done, big difference in your options..

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post #3 of 13 Old 09-26-2019, 06:06 PM
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seems lots of universal db killers for akro exhausts.. see eg/starting point for searches;







if you can make things basic db reducers are like simple perforated tubes into outlet and/or perforated discs between end midpipe and muffler..
[my leo vince evo II had both such reducers, eu approved]


until excess noise solved sound level potentials are still in your right hand,, ie, how much throttle you use is a big factor..
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post #4 of 13 Old 09-26-2019, 11:45 PM
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I don't think your going to find any after market exhaust that is as quite as stock-reason is on the CB300 the catalytic converter is in the muffler which takes away much of the noise
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post #5 of 13 Old Yesterday, 05:10 AM Thread Starter
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Originally Posted by airhead83 View Post
In the States, the OEM muffler or full exhaust would probably be yours for the taking. Just to clear the extra parts from someone's garage, since this is often the first thing to be modified. Just to be clear, are you talking about needing to replace the full exhaust from the head back?, and including the catalytic converter?, and muffler?? Or, just the muffler?? Because, after the "cat" is removed, you're talking a retune, controller, etc... Big difference in price. Or if it's already been done, big difference in your options..
I'm only talking about the muffler, the final exhaust, not the whole system. I mentioned that when I asked for the price offer at the dealer. That price was for the muffler and the mounting accessories. From what I can tell everything else is stock.

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seems lots of universal db killers for akro exhausts.. see eg/starting point for searches;







if you can make things basic db reducers are like simple perforated tubes into outlet and/or perforated discs between end midpipe and muffler..
[my leo vince evo II had both such reducers, eu approved]


until excess noise solved sound level potentials are still in your right hand,, ie, how much throttle you use is a big factor..
I've been holding back on throttle for that exact reason but no matter what I do it still seems too loud. The fake Akra already has its silencer but it's garbage really.

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I don't think your going to find any after market exhaust that is as quite as stock-reason is on the CB300 the catalytic converter is in the muffler which takes away much of the noise
What do you mean the catalytic converter is in the muffler? For real? Is that why the OEM Muffler is so expensive?
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post #6 of 13 Old Yesterday, 06:12 AM
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What do you mean the catalytic converter is in the muffler? For real?
Yes, for real. That is why it weighs about the same as a small boat anchor.

Sometimes with those cheap mufflers you can remove the end cap off the end of the canister by drilling out the rivets or whatever and add more exhaust packing around the baffle tube and then fit it back together again.
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post #7 of 13 Old Yesterday, 07:37 AM Thread Starter
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What do you mean the catalytic converter is in the muffler? For real?
Yes, for real. That is why it weighs about the same as a small boat anchor.

Sometimes with those cheap mufflers you can remove the end cap off the end of the canister by drilling out the rivets or whatever and add more exhaust packing around the baffle tube and then fit it back together again.
Well.. knowing that, I assume my CO2 emissions are also pretty screwed.
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post #8 of 13 Old Yesterday, 04:18 PM
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Well.. knowing that, I assume my CO2 emissions are also pretty screwed.
I wouldnt worry about that.
Are you bothered for environmental reasons or legal reasons?

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post #9 of 13 Old Yesterday, 08:48 PM
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the cat is also reason for excessive [touch burn] heat in cbr300r muffler, the main impetus for switching to a leo vince carbon evoII - same as my cbr250r that for excessive weight but also add-on incongruous design..
honda did a good job imo designing the 300 muffler, except for the excessive and dangerous touch burn heat..
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post #10 of 13 Old Today, 02:58 AM Thread Starter
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Well.. knowing that, I assume my CO2 emissions are also pretty screwed.
I wouldnt worry about that.
Are you bothered for environmental reasons or legal reasons?
Mostly legal but if I solve the noise issue I won't go looking to solve the CO2 as well..
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