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RLV B91XL 1-5/16 Box Stock Legal (Round Hole) Muffler
4104 RLV B91XL 1-5/16” Legal (Round Hole) Muffler
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RLV B91XL 1-5/16 Box Stock Legal (Round Hole) Muffler

Part Number: 4104
Online Price: $49.49
RLV B91XL 1-5/16" Muffler – Box Stock Legal Round Hole Exhaust
Availability: In Stock.

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Description

RLV B91XL 1-5/16" Box Stock Legal Muffler – Round Hole Exhaust Silencer


The RLV B91XL Muffler is a round-hole, steel exhaust silencer designed specifically for Box Stock clone engines and Briggs LO206 classes where track regulations mandate muffler use. It’s the go-to option for tracks enforcing sound limits due to local noise ordinances, providing legal compliance without choking engine performance.


Compatible with 1-5/16" OD 4-cycle exhaust pipes, this muffler is also adaptable to 1-1/4" OD headers with the use of an optional RLV 4134 shim (sold separately).


If you’re running in an open class where mufflers are optional or less restricted, consider the RLV B91MO or 4106 high-flow mufflers for increased performance. And if you’re not required to run a muffler at all—expect even more power gains without one.


Muffler Specifications:

  • Mounting Inner Diameter: 1-5/16"
  • Outside Diameter: 2.25"
  • Overall Length: 7"
  • Weight: ~0.9 lbs (412g)
  • Material: Durable Steel Construction
  • Clamp Included: Yes – worm gear clamp for header support
  • Mounting Bracket: Not included (recommended: 1-3/8" / 36mm clamp, sold separately)


Key Features:

  • Track-legal round-hole baffle for noise-restricted classes
  • Designed for Box Stock and LO206 racing formats
  • Easily mounts to 1-5/16” OD pipes or 1-1/4” with shim
  • Includes worm clamp for added support
  • Lightweight and durable for racing conditions
  • Industry-standard silencer for karting compliance


Approved For Use In:

  • Briggs LO206
  • Briggs Animal Stock
  • Clone 196 Box Stock
  • Ducar 212 Box Stock
  • Predator 212 Box Stock
  • Ghost 212
  • Most Box Stock Honda/Clone engine classes

Note: Always verify muffler requirements with your local track or series rules before use.

FAQ

Q1: What is the difference between the RLV B91XL and B91MO mufflers?

A: The B91XL features a round-hole internal baffle and is track-legal for sound-restricted classes like Box Stock and LO206. The B91MO uses a square-hole baffle for higher flow but is louder and may not be allowed at all tracks.


Q2: What header pipe size does the B91XL fit?

A: It fits 1-5/16" outer diameter (OD) header pipes. You can also fit it to 1-1/4" OD pipes using the RLV 4134 shim(sold separately).


Q3: Is this muffler legal for LO206 racing?

A: Yes. The B91XL is approved for Briggs LO206, Animal Stock, and other Box Stock classes that require mufflers for sound compliance.


Q4: What engines is this muffler compatible with?

A: Common fitment includes:

  • Briggs LO206 & Animal Stock
  • Clone 196 Box Stock
  • Predator 212 (Box Stock classes)
  • Ducar 212
  • Ghost 212
  • Other Honda GX200/Clone-based engines


Q5: Does this muffler come with mounting hardware?

A: It includes a worm gear clamp for basic pipe support. A mounting bracket (1-3/8" / 36mm) is recommended for track use and sold separately.


Q6: Will this muffler reduce performance?

A: All mufflers slightly reduce top-end performance compared to open headers. However, in muffler-mandated classes, this model offers a good balance of compliance and flow.

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