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Discussion Starter #1
No Exhaust Muffler!!!

Took the exhaust muffler off my bike today!
Man does it sound a lot better and not really that much louder.
The Cat. does a good job of muffling the exhaust.
Also for some reason, the exhaust diameter out of the Cat. is smaller than the Honda CBR250!! <-----(which is weird).
I have a CBR250 Leo Vince Corsa Exhaust for reference.
 

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Took the exhaust muffler off my bike today!
Man does it sound a lot better and not really that much louder.
The Cat. does a good job of muffling the exhaust.
Also for some reason, the exhaust diameter out of the Cat. is smaller than the Honda CBR250!! <-----(which is weird).
I have a CBR250 Leo Vince Corsa Exhaust for reference.
That is interesting..
good to know.. haha

Also can you get us a sound clip of it with, and without the muffler..? Or just without since we can pull other clips of it with..
 

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Discussion Starter #3
Also can you get us a sound clip of it with, and without the muffler..? Or just without since we can pull other clips of it with..
Yeah that shouldn't be a problem.
I'll probably do a video, cause my GoPro has the best mic.
It might be a little bit but I'll try.
 

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Could be the backpressure is created at the cat. converter? It would explain the Akrapovic GP pipe. From what I heard, nothing more than a straight pipe for the R25 or R3.





But hey, be careful with your new bike. You know messing around with that stuff could void your warranty.
 

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Yeah that shouldn't be a problem.
I'll probably do a video, cause my GoPro has the best mic.
It might be a little bit but I'll try.

That would be awesome bro. Whenever you get around to it.
 

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Discussion Starter #6
But hey, be careful with your new bike. You know messing around with that stuff could void your warranty.
Only if I changed out the entire exhaust. This is the same as putting an aftermarket muffler on.
 

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Nice. Sounds good. and your right. It Isn't that loud without the muffler.
 

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Cptnight,


OK, I'm officially confused....lol. Why did you pull off the muffler? Attempting to uncork some power or just making it louder?


Have you Dyno-ed your bike already? If so, could you tell up the HP at or just before redline?


If your looking for sound, that's understandable..... But did you reset or custom map your ECU? I'm not sure your O2 sensor is very happy about the decrease in restriction and you may want to check with your local dealer that you don't void the warranty.....


Cheers
 

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I personally am not fond of the sound at all.
it makes the bike sound like a 50cc 2 stroke!
Not the new muffler, but the engine design itself.

I like the sound of vtwins, and understand people liking those louder.
But for this bike, they should have just gone with a 360 degrees ptwin.

Sound on a sportsbike, or on any ptwin engine don't matter to me, it's sounding like a fly, rather than the thunder sound of a vtwin.

a 360 degree ptwin would usually be more quiet, vibrate less, and has a more balanced load on the pistons. They also could increase the rev limiter more easily on 360deg over 180deg ptwins.

It definitely is a gripe of the R3 that makes me lean more towards the CB500X or F.

Honda has a 90 degree angle on their CN700 and CN750 bikes, that also have a ptwin. It much more sounds like a Vtwin, but also sounds like a single cylinder bike, and vibrates like crap, and needs a heavy counter weight eating away initial torque when revving up the engine. That's why I stayed clear of those 700s.
 

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Discussion Starter #14
a 360 degree ptwin would usually be more quiet, vibrate less, and has a more balanced load on the pistons. They also could increase the rev limiter more easily on 360deg over 180deg ptwins.

It definitely is a gripe of the R3 that makes me lean more towards the CB500X or F.
I hate to break it to you but the CBR500R/CB500F/CB500X is also a 180Deg. engine, it's just more square shaped.

I know cause I had a CBR500R and traded it in for a R3 and in my opinion the R3 is alot funner bike.
 

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I hate to break it to you but the CBR500R/CB500F/CB500X is also a 180Deg. engine, it's just more square shaped.

I know cause I had a CBR500R and traded it in for a R3 and in my opinion the R3 is alot funner bike.
I was of the impression that the 500 was 360 Deg.
i know the 700/750 are angled as well.

If that be the case, I'd prefer an R3 indeed, especially 'cause the 500s are heavier than I expected (almost 50lbs heavier than the R3).
 

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CptNight how's the bike running? Have you found the cat.converter to be the point of restriction on this exhaust?
I've read that a bike with a slip-on will run slightly leaner but not so much that it needs a fuel controller. The bike runs slightly leaner because the slip-on usually opens up the exhaust.
However, if the cat.converter is the point of restriction, a slip-on or removing the muffler all together should not be opening up the exhaust for better flow?
So, from what I've read, a leaner running bike will move the powerband higher into the RPM range (losing some bottom end) and will backfire sometimes.
Have you noticed any of this?
 

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I want to remove mine once I get it, not worried about emissions and all that, has any one done this to there bike or have any info on it regarding the R3? I cant find anything on it yet.
 

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Removing the the CC is easy, just get a hacksaw and have at it, but... Do you want to remove the CC and have a hole there? Or do you want to remove the CC, and replace it with a mid pipe, while keeping the stock muffler? Or do you want to remove the entire OEM exhaust system and replace it with a third-party race exhaust? etc. etc.
 

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Removing the cat will require you to addon some form of fuel management system.

Without altering the fuel tables you will not make any significant power gains (might even lose power), fuel economy will likely suffer and you WILL void your warranty, you can cut it out without doing it, but its totally pointless.
 
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