Exhaust

Power valves are utilized to open and close a two-stroke cylinder’s exhaust port as needed when the engine’s rpm changes
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The 2023 KTM 450SXF makes close to 60 horsepower and 36.31 pound-feet of torque. So, why would you need an aftermarket pipe? That’s simple. To create power that is more manageable and easier to use
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Kawasaki’s KX112 SuperMini model is close to being race-ready off the showroom floor, but it still needs some work—the Pro Circuit pipe increased power by 1.5 horses
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George Banke pioneered the idea in motocross, but it took 25 years for his idea to catch on—then it only lasted two seasons
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MXA Test riders noticed a more connected feel from their right wrist to the rear wheel and while the FMF system didn’t do anything for the top-end, test riders were happy with the added low-to-mid
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We waited 16 years for a “KTM beater” YZ125. When it finally hit the showroom floors, it was a couple horses short, but the Circuit Works pipe narrows that gap
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You can’t compromise on the shape and free-flowing design of the ports — which is exactly where Twisted Development’s KTM 450SXF exhaust flange comes into play.
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Scalvini's stamped pipes don’t have the old-world charm of their cone pipes, but they have the same dimensions as their arts-and-crafts brothers and absolutely no performance differences
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This pipe burst out an extra 3.46 ponies at 8000 rpm and peaks out at 9600 rpm, producing 49.33 horsepower, which is 2-1/2 more than stock at peak
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The Powercore 4 HEX Kawasaki KX450 muffler is the cheapest slip-on power option offered by FMF Racing
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The Doctor knows what makes the YZ250F ticks, why wouldn't he? Doug was the factory Yamaha test rider on the original product
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Everything you need to know about the FMF Factory 4.1 RCT exhaust system for the FC350
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Any aftermarket exhaust that can better the stock KTM 350SXF should be nominated as the Grand Poobah
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The Pro Circuit exhaust gave the 2019-2020 RM-Z450 the excitement factor we were looking for, especially off the bottom
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With a peak of 49.77 horsepower at 8600 rpm, the TE300i was much faster than we expected. What we didn’t expect was a big flat spot in the middle of the powerband
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The stock 2019 Honda CRF450 has the most aggressive power in its class and riders struggle with the jerky hit out of the turns—enter FMF
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Scalvini could make two-stroke pipes cheaper by switching to stampings like their competition, but Scalvini doesn’t want to. They want to make products the Old World Way
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Best of all, it had the exact same powerband as the stock FC350, just with more power
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Scalvini is the king of cone pipes and the choice of two-stroke builders looking for something very special, whether for a KTM 50SX or Honda CR500
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The FMF single made more horsepower, revved through the power faster, got to the meat of the powerband quicker and made the Honda CRF450 easier to ride
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FMF pops the cork on the latest Kawasaki KX450F powerplant — we like it, you will too
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This cone pipe makes the bike easier to ride by adding more mid, top and over rev
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Two for one, but a dollar factor
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it pumped out 61 horsepower over the stocker’s 58 horsepower
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Best description (in one word) — explosive
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More power for the 2015 Suzuki RM-Z45
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Missing from the scene for a few years, Bill’s is back with a blast
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Making pipes the old fashioned way
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A proven Hooska Boosta for the 2014-15 FC250
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This pipe and and a drill are the keys to success
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