Stillen® 504451 - Stainless Steel Cat-Back Exhaust System with Split Rear Exit

15 reviews|Item # mpn4533373805
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    • Remember to check your local or state laws regarding vehicle noise restrictions and Emission Standards.
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    $1,573.84
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    Vehicle Fitment

    Infiniti

    Specifications

    Exhaust System Type
    Cat-Back
    Exhaust Tubing Material
    Stainless Steel
    Exit Location
    Split Rear
    Exhaust System Sound
    Aggressive / Loud
    Exhaust Inlet Connection Type
    Bolt-On
    Tip Finish
    Polished
    Greatest Incremental Horsepower gain
    26.3 HP @ 4,680 RPM
    Greatest Incremental Torque gain
    29.5 lb-ft @ 4,680 RPM
    Catalytic Converter(s) Included
    No
    Exhaust Type
    Dual in/Dual out
    Exit Location
    Split rear
    Hardware Included
    Yes
    Muffler Configuration
    Single inlet/Single outlet
    Muffler Finish
    Polished
    Muffler Included
    Yes
    Muffler Material
    304 stainless steel
    Muffler Quantity
    Two
    Quantity
    Sold as a kit.
    Remanufactured
    No
    System Finish
    Natural
    System Material
    304 stainless steel
    System Style
    Cat-back
    Tip Color
    Polished
    Tip Cut
    Slant
    Tip Edge Style
    Rolled edge, double-wall
    Tip Included
    Yes
    Tip Material
    304 stainless steel
    Tip Quantity
    2
    Tip Shape
    Round

    Features

    • Authoritative Tone Under Throttle
    • Increase of Horsepower and Torque
    • Designed to provide long-lasting service life
    • Made utilizing state-of-the-art equipment
    • Engineered to offer the ultimate in strength and reliability

    Product Details

    Stainless Steel Cat-Back Exhaust System with Split Rear Exit (504451) by Stillen®. Exhaust System Type: Cat-Back. Exhaust Tubing Material: Stainless Steel. Exhaust System Sound: Aggressive / Loud. 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. Increase the performance of your vehicle with the Stillen Cat Back Exhaust System. This Stillen Cat Back Exhaust System improves the sound and performance of the vehicle. Stillen pride ourselves in designing an all-new cat back exhaust system that strikes a great balance between the performance minded enthusiast and daily drivability.

    As with any turbocharged vehicle, Stillen found quite a bit of power on the Infiniti Q50 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 a 26WHP and 29WTQ Gain. Those numbers are nothing to sneeze at, and you'd be hard pressed not to notice an additional 29lb/ft of torque.
    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.
    Also available is a unique polyurethane Stillen Rear Bumper Valance Diffuser for your Infiniti Q50 designed to complete the look and fit the Stillen Exhaust outlet tips perfectly.

    Power is the primary purpose of the Stillen Exhaust System on your car. However, sound is a close second. With an authoritative growl that has become easily recognized at the Stillen trademark sound. This exhaust is mild at low RPM and comes alive when pressed into the higher RPM ranges. The free flowing mufflers keep the sound down when you want to be civilized but let you be heard when you want to let loose.

    Stillen® - Stainless Steel Cat-Back Exhaust System InformationMade In USAStillen Authorized Dealer
    Brand:
    Stillen
    Part Number:
    504451
    UPC:
    600700002955

    Reviews

    (15)
    Only authorized customers can leave a review on our website. We would love to know what you like or dislike about the product. Share your opinion on product quality, appearance, installation, and other characteristics.
    /5
    1-10 of 15 Reviews
    5 of 5
    Perfect
    Love the sound and the look the carbon fiber added to my vehicle. Great investment very happy with this purchase.
    Posted by Randy (Salisbury, MD) / March 19, 20252023 Nissan Altima
    5 of 5
    Amazing sound upgrade!
    I had this installed on my G37 and it completely transformed the sound! At idle it's quiet but once you get on the throttle, it roars! Not too loud to be annoying, just perfect.
    Posted by Joseph (Las Vegas, NV) / September 15, 20242011 Infiniti G37
    5 of 5
    About 15 HP. Easy Install.
    I have a 2020 Maxima, 300 hp. Wanted a bit more. Toyed with the idea of getting the cat back exhaust. I did not expect much as the 2 Cats are the limiting factor in this exhaust. Product was of high quality. Welds looked good. I was too lazy to install myself so I had Midas do it for $165. Everything fit perfectly. Sound: At idle and crusing speed it has a low drone. Acceleration adds a crackling sound. Not too loud. Performance: Interesting result. The maxima has a CVT that has *fake* shift points upon maximum acceleration. The engine revs from about 5300RPM to 6100RPM and then goes back down the 5300 RPM for the next "shift". After I installed, I noticed the RPMs of the fake shift were higher. It now starts at about 5600 RPM and goes up to 6300 RPM. I assume the ECM senses less back pressure and is knows the torque band has moved into a higher RPM range and has adjusted accordingly. Enthusiasts HATE this ECM and blame it for sabotaging their performance add ons. In this case it seems to be working in concert with the Stillen exhaust. Observation: The car starts off as usual and then has increased power above 4000RPM. Is it dramatic? No. Is it noticeable? Yes. Did I put it on a dyno? No. A YouTube video shows a middle aged man explaining, installing and dyno testing his Stillen exhaust on a G37 3.2 engine. Similar to the Maxima engine. His dyno test showed 17 HP increase. he also had added a K&N air filter as I did. 15hp increase sound about right. Value: It cost about $1200 and it adds some power. Yes, it was worth it. Guys at Stillen and CarID were helpful.
    Posted by Customer / October 08, 20222020 Nissan Maxima
    3 of 5
    Catback Exaust
    Not very loud as it’s rating on the website.
    Posted by Tyarn (Henrico, VA) / September 27, 20222008 Infiniti G35
    2 of 5
    Sounds Good, but Defective
    So I purchased the exhaust and installed it. It sounds great, but when I installed it, the right exhaust was way off on placement. The left side sat perfectly, but the right side sat way off to the right and lower than it should. I couldn't return it for a replacement because I had installed it already, but I wouldn't have known of the issue until then. So I had to have it modified so the right exhaust can sit in the proper place it needed too. I'm not sure if it's the way the manufacturer made it, or if mine was just defective. If you want to take that chance, go ahead.
    Posted by ANYANNETE (Perris, CA) / October 04, 20202018 Infiniti Q60
    2 of 5
    Sounds Good, but Not Loud
    Sounds awesome! But only when you're within 2 feet of the rear of the car. It's an amazing deep growl, but the volume of it is very low. For advertising a max loudness I am very disappointed.
    Posted by Customer / September 13, 20202008 Nissan Altima
    5 of 5
    Amazing Product
    Love this!!
    Posted by Steven (Southington, CT) / February 06, 20202016 Nissan Altima
    5 of 5
    Great Exhaust!
    Great exhaust system for a car that has limited options for the G35x model. It was exactly what I was looking for, no drone calm under daily driving, nice tone under spirited driving. They don't provide enough gaskets or bolts to get the job done in one sitting. Include the 2 extra gaskets and 4 bolts to get the job done! Seriously, you could charge for it and it would make customers much happier!
    Posted by Jordan (Abbotsford, WI) / December 17, 20192006 Infiniti G35
    5 of 5
    Fantastic
    While having my car serviced at a local Nissan dealer I asked two experienced mechanics what exhaust sound and appearance upgrades they would recommend. Both recommended the Stillen Axle-Back Exhaust System for looks, sound, and ease of installation. I couldn't agree more now that they're on my 2016 Nissan Maxima Platinum. I've received many compliments. I also ordered the Stillen splitter and rear diffuser.
    Posted by Mark (Raleigh, NC) / October 22, 20192016 Nissan Maxima
    5 of 5
    Awesome Exhaust.
    Direct fit. Nice mellow tone at idle. Deep tone during acceleration. No drone.
    Posted by Adrian (San Jose, CA) / September 04, 20192016 Nissan Maxima

    Questions and Answers

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