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Exhaust Systems Polaris® RZR® 4 900

Print Instructions

HMF Racing Slip On Exhaust Instructions

For Models: RZR® 4 900 (2015-2017), RZR® S 900 (2015-2020), RZR® 900 Trail (2015-2015), RZR® 900 XC (2015-2017)


1. Remove the screws from the plastic rear fascia.  Slowly begin to pull the rear fascia away from the machine.  When there is enough room, reach in and disconnect the tail light harness.  Set the rear fascia aside.

2. Using a long piece of electrical wire or a spring puller, remove the 2 springs at the head pipe-to-silencer joint and the 2 springs that hold the silencer against the frame.  Slowly pull back on the silencer to remove it.  Note:  You can remove the 2 rubber mounts from the frame as they will not be reused.

3. Remove the top nut from the rear transmission mount.


1. Install the HMF silencer bracket using the top transmission mount stud and original nut, and the supplied M8 20 hex bolts, fender washers, M8 nyloc nuts and flat washers.  (Note: Be sure that the top portion of the bracket goes under frame rail.  See Figure #2)

Note: We have found that some frames have a hole under the plastic (leftmost arrow) and some will have a hole where the middle arrow is.  Use whichever mounting hole is present on your frame.  All will have the hole where the arrow on the right is pointing. (See Figure #1)

Slip On Exhaust Instructions - Figure 4(See Figure #2)

Slip On Exhaust Instructions - Figure 1

2. Inspect the original donut gasket for wear or damage and replace it with a new one if necessary.

3. Remove the lower rear facia brackets.  Your HMF exhaust comes with replacement brackets.

4. Using the original mounting bolts, install the HMF replacement rear facia brackets.  (See Figure #3)

Slip On Exhaust Instructions - Figure 2

5. Install the HMF slip on exhaust using the 4 fender washers, M8 40 hex bolts, flat washers, and nylock nuts.

6. Using a long piece of wire or spring puller, install 2 of the original springs at the headpipe-to-inlet joint.

7. Apply the supplied adhesive heat shield material to the inside of the rear facia, near the exhaust inlet.  (See Figure #4)

Slip On Exhaust Instructions - Figure 3

8. Replace rear facia.  Remember to plug in the tail light harness and be sure that the harness is tied away from the exhaust. 

9. Inspect all areas around the exhaust system for proper clearance and alignment.  Adjust as necessary.


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