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Don't want to generalize, but . . . independent dyno charts I have seen show higher horsepower at some regimes with the OEM muffler than with aftermarket silencers. At other rpm regimes, the "trick" muffler registers modest power gains over the stock exhaust.
I believe I've seen the same data as you - there isn't alot out there; Without getting bogged down all I'll say is that I believe any decent silencer (Lexx, LeoVince, Q4,etc.) offers a bit of an increase in the higher ranges without any negative effect in the lower rpm ranges.

2 cents,
Dave
 

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I am not a fan of loud bikes at all, especially those that rev it up as they go by your open car window, not mentioning any particular riders of course ( cough.....hardly davids......cough).
My Hayabusa had M4's when i bought it, they lasted about 6 seconds before i was installing the stock cans. No need for weight savings on that bird at all.

I've replaced the stock silencers on both KLR's for several reasons, namely; lighter weight (5 - 7 lbs)

Dave
That is my thought as well, just the weight savings on the KLR. I bought the Q4 and power bomb for it, read that it was the quietest of the aftermarket pipes as long as you keep the packing in good shape.


Well . . . I don't believe aftermarket mufflers add significant power increase across the rpm spectrum in comparison with OEM mufflers; certainly, with nominally stock engines.

As to, weight-saving, a few pounds to a 400+ pound motorcycle won't produce significant handling improvements, nor mass reduction, seems to me (a half-gallon less fuel in the tank will do the same weight reduction).
I honestly dont think anyone really believes they add more power, they just sound like it. As you mentioned they may rob power. Hoping that with the KLX jet kit i can just keep close to stock power.

Yes 6 or 7 lbs does not sound like much but it is almost a gallon of fuel and when one is on a long road trip loaded with a full complement of gear any weight saved is a plus in my book. Certainly going to carry all the fuel my 6.6 IMS tank can carry and more than likely too much gear. Lol

Just my thoughts

Arctic
 

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I am not a fan of loud bikes at all, especially those that rev it up as they go by your open car window, not mentioning any particular riders of course ( cough.....hardly davids......cough).
My Hayabusa had M4's when i bought it, they lasted about 6 seconds before i was installing the stock cans. No need for weight savings on that bird at all.



That is my thought as well, just the weight savings on the KLR. I bought the Q4 and power bomb for it, read that it was the quietest of the aftermarket pipes as long as you keep the packing in good shape.




I honestly dont think anyone really believes they add more power, they just sound like it. As you mentioned they may rob power. Hoping that with the KLX jet kit i can just keep close to stock power.

Yes 6 or 7 lbs does not sound like much but it is almost a gallon of fuel and when one is on a long road trip loaded with a full complement of gear any weight saved is a plus in my book. Certainly going to carry all the fuel my 6.6 IMS tank can carry and more than likely too much gear. Lol

Just my thoughts

Arctic

- The Q4 is around 96db which is quieter than many of the aftermarket silencers and is trail compliant here.....but it isn't the quietest; that would be a tie between the LeoVince X3 and the Lexx with the trail insert - both are around 94db. I have a Q4 on my 2001 and a LeoVince on my 2000....the LV is noticeably quieter.

- Your Q4 will NOT cost you any power and you'll get a small boost with it plus the KLX kit (make sure you pull the snorkle as per Eaglemike's recommendation).

Cheers,
Dave
 

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Yes 6 or 7 lbs does not sound like much but it is almost a gallon of fuel and when one is on a long road trip loaded with a full complement of gear any weight saved is a plus in my book.

Arctic
Agreed; many will say that the weight saved is negligeable but it all adds up. I'd rather carry 7 lbs of something useful.

Dave
 

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- The Q4 is around 96db which is quieter than many of the aftermarket silencers and is trail compliant here.....but it isn't the quietest; that would be a tie between the LeoVince X3 and the Lexx with the trail insert - both are around 94db. I have a Q4 on my 2001 and a LeoVince on my 2000....the LV is noticeably quieter.

- Your Q4 will NOT cost you any power and you'll get a small boost with it plus the KLX kit (make sure you pull the snorkle as per Eaglemike's recommendation).

Cheers,
Dave
Thank you for the info.

Arctic
 

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God i hate loud bikes....

I want to make my KLR as quite as possible,
What is the best "hunting friendly" muffler for this bike?
 

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God i hate loud bikes....

I want to make my KLR as quite as possible,
What is the best "hunting friendly" muffler for this bike?
There is nothing quieter than the stock muffler. But, you might quiet it a bit more by welding a 'turn-down' tip of the same size pipe onto the existing tip.
 
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interesting.... I will look into it. I want to use this bike to do scouting(So I don't beat the 1 ton up on the back roads unless I have to pull an animal out).

The KLR Is perfect for the task... I can legally take it down the back roads roads... then punch out down the cut lines into areas that I want to scout on foot.. but not walk 10km to get to from the MSR.
 

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I hate to say but,,I started my pipe mods by taking out the tweeter center tube,,sounded a bit better but still kindof sewing machine like. Then I saw a vid of some guy who cut open an entire klr stock exsaust,,and I couldnt believe how choked the flow is at the back of the pipe. Looked on the web a bit and saw a vid of a guy who installed a glass pack from the connector back 1/2{next to rear brake fluid tank} and it was a nice sound,,but will he burn valves? Sounded like a Ducati,,nice low thump rumble.Im thinkin of tryin something similar
 

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I hate to say but,,I started my pipe mods by taking out the tweeter center tube,,sounded a bit better but still kindof sewing machine like. Then I saw a vid of some guy who cut open an entire klr stock exsaust,,and I couldnt believe how choked the flow is at the back of the pipe. Looked on the web a bit and saw a vid of a guy who installed a glass pack from the connector back 1/2{next to rear brake fluid tank} and it was a nice sound,,but will he burn valves? Sounded like a Ducati,,nice low thump rumble.Im thinkin of tryin something similar
You could do that; a few issues with that solution though;

- weight; the main reason I went with an aftermarket silencer on my KLR's was to save 5-7 lbs. A glasspack or other automotive muffler will likely be much heavier

- Spark arrestor; without a spark arrestor you are illegal on most trail systems in the US and Canada.

- USFS compliance; tied into the spark arrestor issue, the USFS stamp allows you to ride in areas that are inspected.


....those are the biggies though worrying about routing and connections so you don't melt stuff (especially the airbox) are also issues.

My suggestion is to keep it stock or use a good known silencer like the LeoVince X3 or the Lexx if you're on a tighter budget

2 cents,
Dave
 

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I have a cheap ebay glasspack on mine. You can order spark arrestors to install. After a year or so it's pretty loud but I like it. It's Brrrraptastic!
 

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Loud pipes on a Ducati v-twin are awesome when you rumble through a bridge-tunnel in like, Mobile, AL or Norfolk, VA. Harley loud pipes are just obnoxious. Headers and cammed motor on a LS2 GTO, like I have, are always awesome. Loundness from a Honda Civic is annoying. Loudness from a KLR 650 is....I don't really have a judgement there.
 

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Yah, and anyone with quieter ones is an old man...
Yeah, I am almost 60 and my hair is turning gray.

But I have been riding my OEM stock exhaust KLR since I was 28 years young. :)
 

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It's amazing how many motorcycles need to be constantly revved at stoplights to keep them from dying. I'm glad mine idles dependably..........

Loud things in public spaces are nothing more than a blatant display of the owner's disrespect for those around him/her whether it be an extremely loud motorcycle, a Honda Civic with a Homey Pipe, a Glasspacked "superchipped" Dodge Ram or any vehicles with a thumping stereo you can hear and feel from 2 blocks away even when they have their windows rolled up. Or, most annoying of all, a motorcycle with a stereo blasting loud enough to overcome the sound of the loud pipes.....

It comforts me to believe there's a special place in Hell for people like this: forever subjected to a deafening and never-ending loop of Minnie Riperton's Loving You. and Starship's We Built This City.
 
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