No Drone Yet Great Sound!  Anyone with a factory race system will admit that the drone during highway driving is tiresome.  This 4C sport muffler eliminates drone and delivers a sporty sound.   Sector111 were the first to incorporate a Helmholtz chamber to eliminate in-cabin resonance (drone).  Made from high-quality materials in California. This system remains street legal as it is bolted on after the stock catalytic converters.  

No Drone = Blissful Highway Cruising!

• Helmholtz Chamber is a simple method used to target specific low wave lengths that cause drone
  • Supplier used sophisticated measurement equipment to measure the 4C and designed a system that has no drone yet still sounds sporty
• Wind & tire noise is now louder during cruising
• Reduces the flatulant blow-off/wastegate sound as well!  

Street Legal + Sporty Sound = Responsible Yet Happy Driver

• This is a bolt-on solution that is installed after the factory cat
• Fantastic sound keeps the sporty nature of the car intact
  • Watch Video : HERE
  • Watch  Another Video: HERE

High Quality Materials = Long Life & Performance

• T304 Stainless Steel construction
  • complete brush/polish finish
• Polished dual wall tips
• 2" tubing
• Straight through design
  • maintains factory power output
• Uses factory locations for hangars
• Comes with required clamps
  • no cutting or welding
• weighs = 13.7lbs

Cool Design = Different Yet The Same

• Tips exit through the stock rear valence with no modifications
• Tips are slightly larger than stock and fill out the openings better
• Subtle '111' icon cut into the side of the tips

Model Compatibility

• Alfa 4C & Spyder 2014+

Customer Testimonials:

Your exhaust system not only cured all my noise issues and evened out the sound but enhanced the driving experience of the car.

If not for your solution I would have sold the car...

Now I love it.   It has entered the top realm of the many exotic cars I have owned...Again thank you for a terrific solution to a fatal issue.

-Robert L., July 2017

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It actually sounds kind of more sinister at idle from the outside. Quieter but with this guttural tiger growl thing going on. I had my wife drive it around the block to hear it from the outside and it sounds pretty much the same, but maybe at 80% of the original volume. Still the loudest car I've ever owned. 

From the inside it is quiet until you accelerate. 4k on up is about the same as before. 2,000-3,000 is essentially silent. Even with the windows down. All you hear is tire noise, of which there is a decent amount.

-JWA Aug 2015 (from the 4C Forums)