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Exhaust Systems Polaris® RZR Pro XP®

HMF Racing Dual Slip On Exhaust Instructions

For Models: RZR Pro XP® (2020-2021)

Removal

!!! WARNING !!! Before working on your machine, make sure it is parked on a level surface with the transmission in park and/or the parking brake engaged.

Do not work on any machine with a hot engine or exhaust.  Allow time for all parts to cool in order to reduce the risk of burns.

Blackout Exhausts: Take care not to get grease or oils on the exhaust.  Cleaning our Blackout exhaust with harsh solvents, abrasives, or pressure washers will remove the coating and is not covered under warranty.

1. Remove the plastic fascia covering the original silencer.(See Figure #1)

Dual Slip On Exhaust Instructions - Figure 1

2. Remove the (3) nuts securing the downpipe to the silencer.(See Figure #2)

Dual Slip On Exhaust Instructions - Figure 2

3. Support the downpipe near the (3) bolt flange using a bungee cord or similar method to keep it from falling down when the silencer is removed.

4. Using a spring puller, wire, or rope remove the (2) springs securing the silencer to the frame.  Carefully remove the silencer from the vehicle. Remove the triangular rubber grommets from the frame.

Installation

1. Remove the two upper bolts from the heatshield.  These bolts will not be reused.

2. Remove the nut from the lower transmission brace.  Do not discard this nut.(See Figure #3)

Dual Slip On Exhaust Instructions - Figure 3

3. Install the provided silencer mounting bracket as shown below using the nut previously removed as well as the provided (2) M6-1.0x45 Hex Bolts, (2) #10 Flat Washers, and (2) 33mm Aluminum Spacers.(See Figure #4)

Dual Slip On Exhaust Instructions - Figure 4

4. Install the collector to the factory downpipe using the provided (3) ¼” Flat Washers, (3) M8-1.25 Stover Nuts, and (1) 3-Hole Flange Gasket.  (See Figure #5)

Dual Slip On Exhaust Instructions - Figure 5

5. Slide one of the silencers (they are identical) onto the lower collector pipe.  Loosely secure with the provided (2) M8-1.25x25 Hex Bolts, (2) M8-1.25 Nylock Nuts, and (4) ¼” Flat Washers.  Leave the hardware loose at this point to allow for adjustment and alignment later.(See Figure #6)

Dual Slip On Exhaust Instructions - Figure 6

6. Slide the second silencer onto the upper collector pipe. Loosely secure with the provided (2) M8-1.25x25 Hex Bolts, (2) M8-1.25 Nylock Nuts, and (4) ¼” Flat Washers.(See Figure #7)

Dual Slip On Exhaust Instructions - Figure 7

7. Remove the bungee or other support from the downpipe.  

8. Align the lower silencer so that it is parallel with the vehicle then tighten the mounting hardware.  There is just enough room to slip a 13mm wrench between the silencers and mounting bracket and another 13mm wrench between the mounting bracket and heatshield.

Tip: We recommend aligning the silencers to a fixed point such as the radius rod mounting points or another fixed point on the frame and not the heatshield. 

9. Align the upper silencer to the lower silencer then tighten the mounting hardware.

10. Using a spring puller, wire, or rope install the provided (2) Long Neck Springs between the silencers and collector. (See Figure #8)

Dual Slip On Exhaust Instructions - Figure 8

11. Install the provided License Plate Bracket using the original hardware from the rear fascia plastic.

Note: The license plate bracket has been designed for US motorcycle or automotive license plate mounting standards.  Hardware to mount a license plate is not included.(See Figure #9)

Dual Slip On Exhaust Instructions - Figure 9

12. Place the provided Heat Shield Square on the plastic where it is closest to the top collector pipe.(See Figure #10)

Dual Slip On Exhaust Instructions - Figure 10

Optional: If necessary the rear plastics can be trimmed for a larger air gap between the exhaust and body panels.  In testing no issues were found. High ambient temperatures, slow riding speeds, high loads, and extended idling periods may require the plastics to be trimmed or additional heatshielding. 

Wipe off any fingerprints or markings using a soft cloth and mild detergent such as soap and water or glass cleaner without ammonia.  Once the exhaust heat cycles any oils left on the exhaust may permanently imprint.

If you received a stainless steel exhaust without the Blackout coating it is normal for the pipes to change color as they heat cycle. 

The HMF Blackout exhaust will smoke and put out an odor for the first full heat cycle as the coating goes through its final curing process.  It is recommended to allow this process to happen in a well ventilated area.

All systems will produce a smoke out the end cap after a short initial heat cycle, this is the packing material bedding in and is completely normal.

Discussion

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