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

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

  • Lexx MXe Slip-On Silencer With Mid-Pipe

    Lexx MXe Slip-On Silencer With Mid-Pipe

    Amanda in WI

    Good Slip-on

    Fits great, sounds good, good performance mod. RM shipped it very quickly .

    Read All Reviews
  • FMF Power Core IV S/A Silencer

    FMF Power Core IV S/A Silencer

    Helmut in VIC

    After Race Map this is another Improvement ...

    cant beat the price and great performance .

    Read All Reviews
  • Polaris Stage 2 Upgrade Kit

    Polaris Stage 2 Upgrade Kit

    Derek in CO

    Havent completely installed kit yet

    The exhaust on this kit is perfect. Increase exhaust flow and sounds throatier, its not annoying loud. If anything this is the upgrade to get. I am excited to see how the cams are going to do once installed.

    Read All Reviews
  • FMF Hex Q4 S/A Silencer

    FMF Hex Q4 S/A Silencer

    JEFF in CO

    14 yz 250f

    This pipe is nice and quiet. It seems to choke the bike up a bit. I haven't fine tuned the EFI yet. The fit and finish is very good, but it's about six inches longer than the stock pipe and will probably get damaged in a crash on the right side.

    Read All Reviews
  • FMF Power Core 4 Hex S/A Silencer

    FMF Power Core 4 Hex S/A Silencer

    Sam in CO

    Great pipe for a great price

    If you've mangled your pipe in a crash, look no further. This is a great pipe at a great price. I can't say one way or another about any power increase as I've never ridden my bike with an OEM pipe, but I wouldn't hesitate to buy FMF again. Only complaint is that the "graphics" on the pipe scratch very easily and the graphics on one side peeled completely off.

    Read All Reviews
  • FMF Factory-4.1 RCT Stainless Steel Silencer

    FMF Factory-4.1 RCT Stainless Steel Silencer

    jeromy in NE

    instant performance upgrade

    Besides the coolest exhaust note yet: this along with the FMF Grunt added imediate & noticable improvement in the throttle response & low end for my bike over the stock silencer. I hope I don't have to but I'd purchace it again. I typed FMF grunt when meaning FMF Snap.

    Read All Reviews
Frequent Buyer ProgramParts Finder