• 12" megaphone muffler
• Black ceramic Armor Coat™ 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

Sound Clip Preview:

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 (14-15) 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