• 14" megaphone muffler
• Show-polished finish
• 2.25" outlet permanent baffle
• Great look and aggressive sound
  (optional noise reduction insert sold separately)
• No modifications required
• Aerospace quality, ultra lightweight stainless construction
• Eliminates the OEM catalytic convertor
• 74% weight savings vs OEM muffler/catalytic converter
• Two 12mm O2 bungs and one 18mm O2 bung pre-installed
  on collector (block-off plugs included)
• An easy and affordable way to customize your bike
• Includes muffler, collector, and necessary hardware
• Includes PAIR block-off cap for decel-pop reduction
• Designed to work with OEM front section only
• Click here to view logo plate color options
• Click here to view exhaust installation instructions
• Click here for PAIR block-off instructions
• Click here for exhaust sound preview (video)

Sound Clip Video:

Brock’s Performance Slip-On Mufflers will transform any stock exhaust system into a great sounding, customized accessory. Slip-Ons are also very affordable, making them a very attractive option. Logo plates are available in several different colors to give your bike a custom look and lets not forget, at Brock's Performance, all pipes come free with industry-leading technical support.

Dyno Chart: Click image to enlarge

SAE Scale

Dyno Chart: Click image to enlarge

STD Scale

YZF-R1/M (15) Exhaust System Decibel Levels

Testing procedure performed according to SAE J2825

Alien Head 2 Muffler (with Noise Reduction Plug):

Idle: 104dB / 5000 RPM: 110dB

Alien Head 2 Muffler:

Idle: 108dB / 5000 RPM: 113dB

YZF-R1/M (15) Exhaust Weight Comparison

OEM Exhaust System:

• Muffler: 3.0 lb.
• Catalytic Converter: 13.25 lb.
• Heat Shields: 0.80 lb.
• Hardware: 1.15 lb.

Total = 18.20 lb.

Alien Head 2™ Slip-On Exhaust (3/4 System):

• Muffler: 3.0 lb.
• Collector: 1.70 lb.
• Hardware: 0.10 lb.

Total = 4.80 lb.

Total Weight Savings = 13.40 lb. or 74% of OEM weight