Alien Head 2 Full System Black Cerakote® 12" Muffler Grom/MSX125 (14-15)

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Quantity Available: 5+
  • 12" megaphone muffler
  • High-temp black ceramic coated finish
  • Maximized power gains on stock and modified engines
  • 2" outlet permanent baffle (glass wool/fiberglass) for long life, deep sound
  • Larger diameter outlet provides increased exhaust flow
  • Distinctive look/aggressive sound
    (2” optional noise reduction insert sold separately)
  • Pre-installed 18mm bung for wideband O2 sensor
  • Provides maximum ground clearance
  • Over 60% in weight savings
  • No fairing modifications required
  • Aerospace quality, ultra lightweight stainless construction
  • Note: Designed for use with OEM rearset, modification may be required for use with aftermarket rearset
  • Includes Brock’s lifetime direct support package
    At no additional charge
  • Includes access to Brock's map support program
    At no additional charge
  • Click here to view logo plate color options
  • Click here to view Installation Instructions
  • Click here to view Airbox Modification Instructions

The Alien Head 2™ Exhaust System combines our legendary race-proven performance with the distinctive look and sound of our Alien Head 2™ Muffler. Our most popular exhaust system, Brock personally designed and hand-tuned the Alien Head 2™ Full Exhaust System to find the ideal balance of performance and attitude. Keeping our creative Grom owners in mind, this low-mount exhaust option was designed to tuck up tight along the engine to provide the most ground clearance available. Now you can stretch and lower your Grom without being restricted by your exhaust.

Visit our Grom Information Page for product testing videos and other available products

Dyno Charts: Click image to enlarge

SAE Scale

STD Scale

Exhaust Weight Comparison:

OEM Exhaust System:

  • Hardware: 0.15 lb.
  • Front Section: 3.20 lb.
  • Muffler: 7.65 lb.

Total = 11.00 lb.

Brock's Performance Alien Head 2™ Full System:

  • Hardware: 0.45 lb.
  • Front Section: 1.30 lb.
  • Muffler: 2.40 lb.

Total = 4.15 lb.

Total Weight Savings = 6.85 lb. or 63% of stock weight

Honda Grom Exhaust System Decibel Levels

Testing procedure performed according to SAE J2825

Alien Head 2™ Muffler:

Idle: 101dB / 3000 RPM: 107dB

Alien Head 2™ Muffler (with Noise Reduction Plug):

Idle: 93dB / 3000 RPM: 103dB

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  • 5

    Posted by Corey on Apr 26th 2019

    The alien head 2 sounds and looks amazing on the first gen grom but is loud enough to be ticketable if you have loud exhaust fines in your area

  • 5
    Right on Targe

    Posted by Darren on Jan 30th 2018

    Looks, sound, and there any need to say more ?? This system delivered exactly what I wanted in an exhaust for my GROM. Clean looks, a sound much more than you would expect from a 125cc single, and the increased performance that put usable power right where it needs to be. As always, customer service and support is unparalleled with Brock's Performance !!