Dirt Bike 4-Stroke Exhaust | Rocky Mountain ATV/MC

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4-Stroke Exhaust

4-Stroke Exhaust from Rocky Mountain ATV/MC

Exhaust systems in either full race or with tuneable spark arrestors and different tips to give you that perfect power output for either motocross or trail riding.

Latest Dirt Bike 4-Stroke Exhaust Reviews – You could win up to $500 for reviewing products!

Yoshimura RS-3 Stainless/Aluminum Slip-On
JAMES in AZ
great performance
yoshimura rs-3 silencer is great,add a jet kit and an air cleaner and the power is unbelievable. the instructions for jeting are right on.
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Pro Circuit T-4 S/A Silencer
Cody in PA
Awesome pipe but not so awesome fit
This pipe came installed on my 06 YFZ450...I noticed that the slip-on was noticably larger that the stock head pipe. The exhaust leaks but nothing to worry about. I would deff. concider this pipe again, but I do think that the design isnt the greatest because both mounting tabs are broken on my pipe.
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Vance & Hines Ti-Pro Complete Exhaust System
Marc in WY
Great exhaust system
Installed on my 08 yz450f fit and finish excellent. Sounds about the same as my factory short muffler 08. maybe a little louder. has better mid-range response and revs quicker. Looks great after a couple hours of riding- turns blue. overall I am happy with it. Would recommend getting a guard for the head pipe though, none comes with and like factory easily exposed to damage.
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FMF Factory-4.1 Silencer With SS Mid-Pipe
michael in WA
Added power and great sound
Love how easy to install, and sounds awesome!
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FMF Factory-4.1 Silencer With TI Mid-Pipe
RICK in UT
FMF 4.1 for KTM 250
WOW!! This exhaust makes my 2010 KTM 250 XCF-W run much better. More power at low and mid RPM and gains RPM's much quicker. The FMF muffler is 1 lb 3 oz lighter than the stock muffler. I borrowed a decible meter, stock muffler is 96-97 db, FMF is 98-99 db. The FMF is louder and has a much lower tone. It seems to make my bike run a bit hotter. Suggestion for RM ATV/MC: Change the picture on your website from a blue muffler to a silver muffler. FMF does make a blue anodized muffler. I thought I was getting/buying a blue muffler but RM ATV only carries the silver. No big deal as the silver looks fine, just a bit deceiving.
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LeoVince SBK LV One EVOII Stainless Steel Slip On
CHRIS in CA
Nice looking but install is a pain
Leo Vince makes good stuff no doubt about it. The SBK stainless steel kit is the one for a '11 KTM 990 ADV. This kit includes the mufflers and new mid pipes. Meaning you have to remove the stock mid pipe. It was necessary to remove the plastic side plates (easy) and the unbolt the sub frame and slide it back an inch or two, not so easy. Be sure to remove the graphite gaskets off the header pipes so new mid pipe the fits the header. The mufflers are well made but not much lighter than the stock. At least the cat elements are out and the mufflers will run much cooler. Everything fit well. Get every thing mounted before thightening thing down. The Leo Vince looks and sounds great but I kind of wish I had purchased the FMF Q mufflers. FMF mounts to the stock mid pipes so much easier install. Additionally, the FMF mufflers are aluminum and much lighter.
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