Slip on exhaust - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 10 Old 06-21-2018, 09:37 PM Thread Starter
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Slip on exhaust

Do slip on after market exhausts increase power? If so which is the most cost effective for a 2008+ KLR650? Much thanks.
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post #2 of 10 Old 06-21-2018, 09:48 PM
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Short answer is some do, others just make more noise. Which one?? That I don't know, but truthfully, you won't notice much if any increase at all by feel and normally, when you run an free flowing muffler you "might" get a couple HP up top, but lots of times you'll lose a couple lbs of torque down low where you will notice it with your ass as a dyno..
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post #3 of 10 Old 06-21-2018, 10:06 PM Thread Starter
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Thanks for the quick reply. I was looking at a FMF PowerCore 4 Slip-On Exhaust which claims to increase HP and torque by 10% for $300. Just bought a used KLR650. I really like the bike but would love more power. If the reviews of the exhaust were accurate it would be worth the expense.
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post #4 of 10 Old 06-21-2018, 10:21 PM
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I think with the slipon your biggest gain will be a considerable cut in weight. Slipons usually weigh in at half or less than the stock muffler.

You'll get a much better sounding bike, but 10% could be a stretch. While it may be possible, you probably won't see a 10% increase across the board without also opening up the intake tract and bumping up the fuel supply. I'd wage that to get 10% out of any slipon muffler you'll need to invest at least $100 in a good professional tuner with a dyno and an exhaust sniffer to get the air/fuel ratio just right. So now you're up to AT LEAST $400 to squeeze 10% which in a roughly 40hp engine is only 4hp. You need to really pay attention to feel a 4hp increase.
This bike will never be fast, but you can get some good sounds from it with some slipon mufflers. Economically viable?? That depends on one's personal finances and whether it is worth it to you as the owner.
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post #5 of 10 Old 06-22-2018, 10:54 AM
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Be very skeptical of any sizeable hp increase due to a slip on alone. .....if you do the "standard" mods of a KLX jet kit, snorkle-ectomy, L-mod, and a decent silencer you may be able to get that 10%.....which is about 3hp on a KLR. Of course you can probably get half that without the silencer. To get any more power you are looking at a 685 kit, then head work, perhaps cams, etc. etc......but it quickly becomes an exercise of diminishing returns. If you are looking for a significant power increase over a stock KLR, the best way to to replace the bike with a KTM690R. ;-)

My standard silencer post;

A subjective topic but to recap recent discussions;

I don't like loud but I've replaced the stock silencers on both KLR's for several reasons, namely; lighter weight (5 - 7 lbs), better tone, better looks. .....I wouldn't recommend it thinking there will be a noticeable increase in power, nor would I put much faith in manufacturer's that claim much in the way of HP increases (with no other changes).

After much research and some testing, I like the LeoVince X3 which is relatively quiet at 94db, doesn't require repacking (the only one that doesn't AFAIK, except for the ridiculously expensive Staintune out of Austrailia), looks decent and has a spark arrestor and USFS compliance. Runner up would be the Lexx with the optional trail insert; also around 94db but it does require periodic repacking. I also like the FMF Q4 but it is a bit louder (though still trail compliant) at 96db (keep in mind that the increase in decibels isn't linear).

There are a great many aftermarket silencers on the market that are far too loud IMO and you'd do best to avoid them.

Good luck,

Dave
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post #6 of 10 Old 06-27-2018, 10:38 PM
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There is a cheaper way to reduce back pressure and improve the tone. It's a 2 inch diameter hole saw to remove the Tweeter at the tail end of the muffler.
My thinking was that Kawasaki wanted to get as much volume in their muffler system as space would permit, to get the best balance of horsepower and controlled sound levels.
The additional benefit of this approach is that allowed the addition of a thing that used to be called a Snuff or Not, so that I can adjust the sound levels as I'm riding.
So if I'm sneaking around on a private trail and don't want to be noticed, I put it in the quiet position. If I'm concerned about deer jumping out at sunset, I open it up into the loud position. It's nothing more than a common washer of the right size welded to a shaft and a little detent that holds it at 90 one way or another.
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post #7 of 10 Old 06-28-2018, 08:16 AM
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You can only expect to get so much HP out of this single thumper. Any HP you'll see bumped is going to be a result of the carb jetting you'll have to do with a slip on.

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post #8 of 10 Old 06-28-2018, 08:39 AM
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I probably should have clarified that the net effect of my Snuff or Not modification described above - is that when it is in the quiet position the bike is just a little bit louder than stock, and when it is in the open position it sounds like an average slip-on.
The main jet is now one size larger than stock and I took the bike to a dyno to see how my carb (22 cent, drilled slide), retarded cam, and exhaust mods had impacted the air fuel ratio. Was delighted to see that I had guessed right and a/f was nearly ideal. I don't have the dyno chart right here but the net effect was to gain maybe 2 horsepower. Still didn't break the magic 40 number though. But that wasn't the point in the first place.
I did all those mods a couple of years ago.
Last year because of excessive oil consumption, I stuck in a 685 piston. My guess is that it probably did pick up another horsepower, so now it maybe has an earth tearing 40. Woohoo!
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post #9 of 10 Old 07-02-2018, 09:45 PM
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I saw a vid on YT where a guy put a glass pack car muffler on the tailend,,sounded great,,and it flows better,,but not sure if it will burn some valves or not
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post #10 of 10 Old 07-02-2018, 09:47 PM
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Quote:
Originally Posted by TLHBill View Post
There is a cheaper way to reduce back pressure and improve the tone. It's a 2 inch diameter hole saw to remove the Tweeter at the tail end of the muffler.
My thinking was that Kawasaki wanted to get as much volume in their muffler system as space would permit, to get the best balance of horsepower and controlled sound levels.
The additional benefit of this approach is that allowed the addition of a thing that used to be called a Snuff or Not, so that I can adjust the sound levels as I'm riding.
So if I'm sneaking around on a private trail and don't want to be noticed, I put it in the quiet position. If I'm concerned about deer jumping out at sunset, I open it up into the loud position. It's nothing more than a common washer of the right size welded to a shaft and a little detent that holds it at 90 one way or another.
cool idea!
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