Choose a vehicle:

User Tip: If you're unsure of your vehicle type, you may skip the machine type selection box.

» Log in to use your Rider Profile Machines

Please select make, model and year

4-Stroke Exhaust4-Stroke Exhaust

4-Stroke Exhaust from Rocky Mountain ATV/MC

It’s no secret that a properly selected aftermarket exhaust system can do wonders for your dirt bike. There isn’t an easier or faster way to add horsepower throughout your bike’s RPM range. When you want a new dirt bike exhaust system, Rocky Mountain ATV/MC is the best source around. We carry an extensive selection of dirt bike exhausts. Do you love FMF exhausts? So do we. Are you looking for a Yosh exhaust system? We’ve got several. How about a ProCircuit T-4 silencer? We carry it. Do you want a Moto Works exhaust? You’re in the right place. Interested in a Lexx MXe slip-on? Get it here at Rocky Mountain ATV/MC. If you own a 4-stroke dirt bike, a new exhaust system is a must have.

Whether you need a new muffler to boost your motocross racing performance or just a good silencer with a USFS-approved spark arrestor for enduro use, Rocky Mountain ATV/MC is the best place to find dirt bike exhaust pipes. We carry all of the leading brands: FMF, Yoshimura, Lexx, Pro Circuit, Motoworks and more. Exhausts are available in a variety of materials as well: titanium, stainless steel, aluminum and even carbon fiber. When you need a 4-stroke exhaust for your motorcycle, you can’t go wrong with these excellent mufflers and silencers. Whether you’re into motocross or just love a good trail, your dirt bike will really rip with these exhaust systems!

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

  • FMF Power Core 4 Hex S/A Silencer

    FMF Power Core 4 Hex S/A Silencer

    Raymond in WY

    Good sound, good price

    My crf450x now has a similar tone to my friends crf450r, the rhythm is still different due to the r's more aggressive cam. The stock exhaust was restrictive and very quiet, so I removed the baffle from the stock muffler and it was too loud. This FMF pipe is a happy medium between the two. One thing I did not like was where the mid-pipe connects to the header pipe, I would like to have a metal clamp similar to the stock one instead of using high temp silicone. But overall the fit was good.

    Read All Reviews
  • FMF Power Bomb Header Pipe

    FMF Power Bomb Header Pipe

    Jason in WI

    The Best!

    Helps with keeping the sound down on my 400EX. Looks great, well built!

    Read All Reviews
  • FMF Q4 S/A Silencer

    FMF Q4 S/A Silencer

    Jason in WI

    The Best!

    I use this pipe with the FMF power bomb head pipe on my 400ex. It keeps the sound legal here in WI and still sounds great.

    Read All Reviews
  • FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap

    FMF Factory-4.1 RCT Aluminum Silencer with Stainless Steel End Cap

    John in AZ

    Improved Throttle Response

    Great fit and finish. Super easy to install with OEM header. Slightly louder but not too bad. I have the spark arrestor inserted for trail riding and the bike revs much quicker on the low end which helps acceleration. No noticeable change to mid or top end power. I am uncertain if power output has improved but the acceleration is smoother and quicker off idle which makes it a great product. I would not hesitate to buy another one.

    Read All Reviews
  • Pro Circuit T-4 S/A Complete Exhaust System

    Pro Circuit T-4 S/A Complete Exhaust System

    John in AZ

    Superior Construction

    Great product. Fits perfectly and easily installed even if limited mechanical experience. There are mounts for the original heat shield too (nice touch). Slightly louder then OEM exhaust but not significant. Better throttle response - quicker revving. Power slightly better but not dramatic. Beautiful appearance on the bike. I would buy again.

    Read All Reviews
  • Lexx MXe Slip-On Silencer With Mid-Pipe

    Lexx MXe Slip-On Silencer With Mid-Pipe

    houston in MT

    pro hill climbing

    love this exhaust. great sound performance. and it held up great very tough exhaust. if I could order this for all my bikes I deffently would.

    Read All Reviews
RM Cash ProgramParts Finder