SKU: 8612443333

Stillen 2016-2021 Infiniti Q50 [3.0t] Cat Back Exhaust System w/ Polished Tips - 504451

Sale price$708.23 Regular price$786.92
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Description

Stillen 2016-2021 Infiniti Q50 [3.0t] Cat Back Exhaust System w/ Polished Tips - 504451Product Features 304 Stainless Steel Construction Polished Tips Greatest Incremental Horsepower gain: 26. 3 HP @ 4,680 RPM* Greatest Incremental Torque gain: 29. 5 lb ft @ 4,680 RPM* Limited Lifetime Warranty *Results May Vary! Infiniti Q50 Exhaust Cat Back with Polished Tips [3. 0L Twin Turbo] BENEFITS: Mild note at idle and Aggressive note under throttle Compliments the factory exhaust cut out nicely Delivers an aggressive look that matches the

Product Features

  • 304 Stainless Steel Construction
  • Polished Tips
  • Greatest Incremental Horsepower gain: 26.3 HP @ 4,680 RPM*
  • Greatest Incremental Torque gain: 29.5 lb-ft @ 4,680 RPM*
  • Limited Lifetime Warranty

*Results May Vary!

Infiniti Q50 Exhaust Cat Back with Polished Tips [3.0L Twin Turbo]

 

BENEFITS:

  • Mild note at idle and Aggressive note under throttle
  • Compliments the factory exhaust cut out nicely
  • Delivers an aggressive look that matches the enhanced exhaust note
  • Direct Bolt-On Installation
Designed and Manufactured in-house at STILLEN HQ in Costa Mesa, CA and inspected multiple times to ensure the highest quality and fit. 

STILLEN has long been associated with Infiniti tuning parts for as long as Infiniti has been around, creating high performance products, and meticulously crafted exhaust systems that have proven time and again to produce the maximum horsepower possible. With the introduction of the 2016 Infiniti Q50 3.0L Twin Turbo V6, STILLEN immediately went into R&D utilizing their many years of experience with VQ engines, and the results were fantastic.

As with any turbocharged vehicle, we found quite a bit of power on theInfinitiQ50 3.0TT's exhaust system. As with the intake system, the Luxury Car nature of the Q means that it was designed with Noise, Vibration and Harshness front-of-mind. That means that power-robbing compromises had to be made, the end result being that your Q50's 3.0TT can't breathe as well or make as much power as it should.

By streamlining the flow of exhaust gases and removing unnecessary restrictions in the system, after dozens of prototypes, STILLEN engineers unlocked a26WHP*and29WTQ Gain*. Those numbers are nothing to sneeze at, and you'd be hard pressed not to notice an additional 29lb/ft of torque*.

*Results May Vary

Customer Review

Take a listen to a Customer's Q50 with the STILLEN Cat-Back Exhaust System w/Carbon Fiber tips.

 

The STILLEN Q50 cat-back exhaust system has an aggressive tone under hard acceleration, but mellow during cruising, with that unmistakable STILLEN sound. The free flowing performance mufflers and tips are constructed of 304 Stainless Steel for long life, and includes a limited lifetime warranty. The piping is mandrel bent for smooth flow, and fuel mileage gains can be expected at cruising speeds.

Designed to fit beautifully into the OEM valance or as a compliment to a STILLEN Rear Diffuser, this system looks as good as it sounds. Available with three tip options to suit your tastes, choose from Carbon Fiber, Polished or Burnt-Titanium Look Tips to give your Q50's rear end that extra something it needed.

 

Y-Pipe

This 2.5" Y-Pipe configuration allows for better airflow. The Y-Pipe than connects to the 3" Mid-Pipe.

 

Mid-Pipe

The 3" Mid-Pipe than carries the exhaust gases to the rear of the vehicle where it branches back into 2.5" dual rear exit.

 

Dual Mufflers w/ Polished Tips

Upon meeting the rear exhaust pipes the exhaust gases flow through the STILLEN engineered and manufactured mufflers. The 4.5" bolt-on exhaust tips enable you to adjust the tip position for a proper fit no matter what bumper or aero you choose to run at the back. Finally, the exhaust note is mild and well-mannered under normal driving conditions, but quickly turns aggressive and authoritative when under throttle.

 

 

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 8612443333

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JJ Fording
Birmingham, US
★★★★★ 5
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Size: Medium
My dog loves chasing these balls. He seems to love the squeak! They fit the chuck it stick perfectly, and are great replacements for the originals that came with the stick.
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Reviewed in the United States on February 7, 2026
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Steve just Steve
Carnegie, US
★★★★★ 5
Nice set of balls
Size: Medium
The squeaker quickly became my dog’s favorite ball and has replaced the fuzzy tennis balls. My dog is a nonstop fetcher and these chuck it balls are durable and fun.
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Reviewed in the United States on January 9, 2026
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Claudia Garfield
Boise, US
★★★★★ 5
Perfect ball
Size: Medium
Our dog loves these!
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Reviewed in the United States on May 26, 2026
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Timothy john starkweather
Chelsea, US
★★★★★ 4
Soild
Size: Medium
The orange and blue ball is perfect. Once start taken because the because the blue noisy one was a little to easy for my dog to start ripping pieces off. Will say most toys do not survive his chewing.
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Reviewed in the United States on January 24, 2026
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Christy D.
Whiting, US
★★★★★ 5
Aggressive chewer who loves fetch approved!!
Size: Medium, Size: Medium
I highly recommend the Chuck-It brand in general, especially for dogs with an aggressive bite. These balls are awesome and are the most durable balls I’ve bought for my 50 lbs lab mix. He has not been able to break one of them yet and we’ve had a few of the squeaky balls for months. They are a bit pricey but worth it. The one in the pic has been used for months, lives outside and you can see it’s still in great shape.
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Reviewed in the United States on June 22, 2025

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