SKU: 47201573104

Kawasaki KLX300 Dual Sport & KLX300SM Full Single Exhaust System 2021-2026

Sale price$359.98 Regular price$399.98
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Description

Kawasaki KLX300 Dual Sport & KLX300SM Full Single Exhaust System 2021-2026Kawasaki KLX300 Dual Sport & KLX300SM Features: Fits 2021 2026 Dual Sport & SM Models (300R exhaust can be found here) Comes standard with a 12" round silver muffler, black tag, and a silver turn down tip Upgrades available include longer 14" muffler, black powdercoat on the muffler, different tag colors, different tip configurations** A black billet exhaust clamp and support bar to strengthen the exhaust perch mount are included O2 bung installed for

Kawasaki KLX300 Dual Sport & KLX300SM Features:

  • Fits 2021-2026 Dual Sport & SM Models (300R exhaust can be found here)
  • Comes standard with a 12" round silver muffler, black tag, and a silver turn-down tip
  • Upgrades available include longer 14" muffler, black powdercoat on the muffler, different tag colors, different tip configurations** 
  • A black billet exhaust clamp and support bar to strengthen the exhaust perch mount are included 
  • O2 bung installed for factory sensor
  • 19% Peak Power Increase with the stock intake
  • 24% Peak Power Increase with modified intake
  • Tuned megaphone-style head-pipe
  • 3lb weight reduction over the stock pipe
  • Optional Add-Ons:  Quiet Core, Spark Arrestor, Power Commander Fuel Controller, EHS Racing Fuel Controller

**This exhaust comes standard with a turn-down tip. You may choose a billet tip if you prefer, but it could melt the stock turn signal. The exhaust muffler length contributes to the sound level. If sound is a concern for you, the 14" muffler is quieter than the 12"; the turndown tip also sends sound down to the ground vs. straight out the back of the machine with the billet tip.

The Full Story:

The KLX300SM is an awesome, nimble, and reliable Supermoto just perfect for an exhaust upgrade. We began fielding requests to build a pipe for these bikes when they were released, following our great success and power gains we've had on the KLX250 machines. We were fortunate enough to find a 300SM at a local dealership and purchased it to get started on a potential pipe design. Right out of the gate, we noticed the KLX300 & KLX300SM are woefully disappointing in the horsepower department, so we set out to build an exhaust system and tuning package that can make these bikes a little more fun to ride. With a stock exhaust outlet about the size of your pinky finger, we knew there was great potential to open the exhaust up and let the motor breathe.

As with all of our new exhaust builds, we hit the dyno with a combination of different header configurations, looking to find the best pipe to suit the 300. After multiple head and mid pipe combinations, we were satisfied that we had found the highest performance-gaining setup. In these initial stages, we didn’t have fuel controller options, but based on the stock fuel mapping, the gains were tremendous with the final pipe design we settled on. The design added 2hp down low and 4hp peak and above 8,000 rpm, carrying the horsepower much further to nearly 8-10hp at redline with pipe alone. Wanting to see what was fully capable, we removed the snorkel first and made a few dyno runs, revealing that the bike gained a touch more with more airflow. When we fully removed the airbox lid, we found it gained quite a bit more, yet, leaving the highest gain hp runs we had seen so far. An open lid and our full exhaust system peaked at nearly 27hp at 8,000 rpm. Down low without the lid, we gained a nice 3-4hp but clearly lean and needing a fuel controller. 

With fuel controllers in hand, we were back at LaBaron’s Power Sports dyno again to build our custom fuel maps and finalize our tuning and testing. Our bone-stock KLX300SM produced 20.34 horsepower at the wheel for our baseline runs. We found the bike really struggles to crest 16hp below 7000rpm, and then all of a sudden, a "2-stroke-like" power curve kicks in out of nowhere. Installing the Barker's exhaust pipe and keeping the stock airbox lid, we gained 2-3 additional horsepower below 7000rpm, 4.6 more horsepower at peak, and 8-10 more horsepower at redline with a much flatter curve from 7-10.5k.

Air/fuel ratios, even with the stock airbox lid and our pipe, showed a few spots that leaned out a bit at some of the lower cruising rpms, so we do recommend a fuel controller. We tested and developed maps for two different tuning options, both with and without the airbox lid. Correcting the lean fuel trim is not an option on this machine, as it goes dangerously lean at the low to mid throttle openings once the intake is opened up. Ultimately, the airbox lid removal is good for an additional 1.5-2hp throughout the curve, and with the proper tuning, you can see a drastic improvement in power from idle to the rev limiter. Our final results with the pipe and modified or removed airbox lid were 2-4hp increases below 7000rpm, nearly 6.3 more peak horsepower, and nearly 11hp more at the rev limit. The curve from peak to read line is almost completely flat, where it used to nosedive on the stock setup. Above 8,000 rpm, the gains run from 20-40% nearing redline.

In summary, the bike responds very well to installing a Barker's exhaust and gains a substantial amount of horsepower. Gains are everywhere in the curve and really take off up top in the over-rev. Modifying the snorkel to a KDX 200 snorkel or removing the lid entirely gains another few horsepower, but definitely requires tuning. In the end, running a KDX Snorkel or open lid, our pipe, and a custom-mapped PCFC or EHS fuel controller gained an unreal 6+ horsepower, going from 20.34 to 26.61 peak horsepower and much more in the over-rev where the stocker used to fall flat. We were able to smooth out some of the abrupt "2nd powerband" to make a smoother transition once it hits that 7k mark, removing the dead spot. It is still there, though, and we have determined that it is due to the machine's camshaft profiles. In summary, the motor loves to rev, and is most happy between 7000 rpm and the rev limiter, but if you enjoy your KLX300SM and just would like 15% or more power everywhere, then this is the solution for you.

Independent Dyno Tuning & Testing completed by Alex at LaBaron's Power Sports in Brown City, MI, and Eric at EHS Racing in Rockingham, NC. 

 

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SKU: 47201573104

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Vshehane
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★★★★★ 5
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When I received these pillows, I followed the directions to fluff them. They were delivered vacuum packed. The first night I slept on them, I didn’t remove any of the filling. That was a problem because the pillows are so over stuffed that it was difficult to sleep on them. I was disappointed until I removed about 1/3 of the filling. Doing so made all of the difference. These pillows are very nice. They keep their shape during the night and provide excellent support for my neck and head. They don’t flatten out or separate like regular shredded foam pillows. They are well made with an outer cooling cover as well as a inner zippered cover for the foam. I love the fact that these pillows are adjustable. I saved the foam I removed in the zippered bag the pillows arrived in, in case I needed to restore the foam in the future. They are a very good value for the money.
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Reviewed in the United States on October 25, 2025
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Amazon Customer
Louisville, US
★★★★★ 4
Not cooling throughout the night
Size: Standard Size(1 Pack)
The quality of the pillow was great the stitching as well. The one side did feel cool, but it did not last throughout the evening. Also, it was too thick for my neck and caused me headaches. The phone pieces that are inside made me concerned that after time they would flatten and the pillow would get firm. I am a hot sleeper and I expected it to stay cool longer than two hours. Because of that I returned it, but if you like thick pillows, and you’re not a hot sleeper, it may work for you.
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Reviewed in the United States on May 4, 2026
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Jake
Phoenix, US
★★★★★ 5
Fantastic I highly recommend him
Size: Queen Size(2 Pack)
We have had these pillows for over a year. I can honestly tell you I absolutely love them. They are cool and extremely comfortable. I like them so much I bought a second set for our camper.
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Reviewed in the United States on June 4, 2026
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Matt
Belleville, US
★★★★★ 3
Decent pillow
Size: Standard Size(1 Pack)
Nice pillow. When first opening it you fluff it and put it in the dryer for about 10 minutes, comes out exactly how I like my pillows, firm but has a little bit of softness. Used this pillow for several nights now. Holds it's shape at the start of the night, but when I wake up its sorta flat and had a smashed feel to it. Fluffs back to it's original size and shape. Just wish it was more dense with about 1/4 to 1/2 more foam inside. Would probably help firm it up and hold it's shape better.
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Reviewed in the United States on June 1, 2026
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MarieKristie
Port Orchard, US
★★★★★ 5
Firm and dense to the Extreme!!
Size: Queen Size(2 Pack)
I love my pillows, extremely firm and also extremely dense. I hate when a pillow gets worn down in the middle after like a few weeks or a month and then you’re struggling to get it full again. It’s absolutely impossible. When I got these pillows, it said that it might take 24 hours for them to fully enlarge. I enrolled them and took a look at this flat thin thing and I thought, oh my God, I made a huge mistake in ordering these. Went into the kitchen, made some dinner after dinner went into my bedroom and holy moly, these pillows were massive. I was so excited and I couldn’t wait to sleep on them. Now mind you, I am a side sleeper, so that’s why I like a very full and firm pillow. I do love how full they are, however, it was a little much. Luckily, you can unzip them and take some of the filling out. A little tip is to keep the little zipped bag they give you and you can put some extra filling in there and zip it and if you ever want to fill it back up, it’s easy. I took about 15% of the filling out of each pillow which to me was perfect, but I could see people wanting to take much more out. I love that you have the option of taking it out and putting it back in if you ever need to, but I don’t think you’ll need to because these pillows will never get squishy or flat. I love these pillows so much that I don’t know if I could ever exist without them. Please never discontinue these because if I ever need to get another set, I want them available. Best pillows I’ve ever had in my entire life. Period!
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Reviewed in the United States on December 15, 2025

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