This is a limited production run and shipments will start the first week of June. We’ll announce whether we do another small run of them for pre order.

  • – Big tube design maximizes performance for the 2019-2022 fuel injected CRF110 132cc Big Bore builds.
  • – Featuring big tube triple stepped head pipe design to insure good low end torque while maximizing higher RPM horsepower.
  • – We purpose built a Chubby muffler with a bigger intake cap and core that creates the correct amount of back pressure and really barks.
  • – Standard 02 bung so all you tuners can get air fuel management dialed in. Tunes will also be available from CJR Performance.
  • – Standard features include carbon fiber end cap and 6″ black hard anodized “Chubby” muffler.
  • – Available for pre order now with estimated shipping date June 21st

Custom lengths and cores available. Please email us directly after placing order.

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2019 – 2022 Honda CRF110 (132cc BIG BORE)

Built using our black hard anodized octagonal aluminum muffler housing and carbon fiber end cap from our full size exhaust systems. The Pit Bike”Chubby” is a short muffler design that features increased volume which adds power and makes an awesome sound. It’s our big bike muffler with all the features including carbon end cap, CNC hanger bracket and four bolt serviceability. Dynoed many different tube and core diameters and made best overall power. Sacrificed .5 hp on top to gain bottom and mid. CJR Performance has a map for the stock ECU that makes more power if you open up the air box. I can tell you what to do if you’re interested.

  • – Octagonal-shaped large volume muffler housing means more power and better sound
  • – Stepped head pipe diameter maximizes bottom, mid and top power over a single diameter design
  • – Carbon fiber end cap
  • – Rebuildable with simple hand tools, no grinding rivets.
  • – In the event of crash-damage, all exhaust system parts are available individually
  • – Optional “Backyard” quiet core available

The Rocket Exhuast

The muffler housing is available in brushed aluminum, black hard anodized aluminum and carbon fiber. The unique muffler mounting system insures a “happy” fit utilizing our adjustable CNC machined hanger bracket and precision mid-pipe to muffler slip-fit.

Head and mid-pipes are constructed from aircraft quality 304 stainless steel. Each model is dyno tuned and track tested to optimize performance and power gains using “stepped” and or “tapered” tube designs.


Carbon fiber end-cap

Standard equipment

Lightweight header/mid

Thin wall 304 stainless steel head and mid-pipe construction

Lightweight muffler

6061 aluminum or optional lightweight carbon fiber muffler housing


Race legal versions available

Optional muffler lengths

(12″-17″) and multiple core designs available

USDA Forest Service

Approved spark arrester optional

CNC machined

Hanger bracket and end cap nozzle

General Warranty

We take care of all our customers. If it is broken, we fix it.


Muffler Length

12″, 14.5″ to 15.5″ (Custom Lengths Available)

Muffler Width

mm (varies per length and core type)

Muffler Tip Diameter

mm (varies per length and core type)

Muffler Weight

lbs (varies per length and core type)

Bracket Material

CNC Machined 6061 Aluminum

Hardware Type

CAD Plated Steel

Header Length

inches (varies per bike)

Header Diameter

mm (varies per bike)

Header Weight

lbs (varies per bike)

Header Material

304 Stainless Steel

Weld Type

TIG Welded

Max Sound Output

dB (std systems meet AMA 94 db, FIM 2 Meter Max avail (not for all bikes) (note larger outlet nozzle and or core dia and shorter muffler housing will add more sound db)

Max Sound Output

94 dB with Stealth Insert

Powerband Change

(every bike is different)

Time to Install

10 minutes

Additional information

Weight 0.000000 lbs


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