STILLEN 504456 Rear Steel Cat Exhaust Split Exit 600700003105

( Brand: Stillen ), ( Brand Type: Aftermarket Branded ), ( Fitment Type: Direct Replacement ), ( Manufacturer Part Number: 504456 ), ( UPC: 600700003105 ), ( California Prop 65 Warning: Cancer And Reproductive Harm. ), ( Type: Cat Back ), ( Department: Performance ), ( Compatible Model S : M56, Q70 ), ( Product Type: Exhaust ), ( Manufacturer Warranty: Lifetime ), ( Tip Finish: Chrome / Polished ), ( Product Details: Performance Cat-back Exhaust System ), ( Country Of Origin: United States ), ( Product Subtype: Exhaust Kits )

Review STILLEN Infiniti Stainless Steel Cat back Exhaust System Split Rear Exit fits M56 2011–2013

Introducing the Stillen 504456 Cat-Back Exhaust System for Infiniti M56 models from 2011 to 2013, a high-performance aftermarket solution engineered to deliver an exhilarating driving experience. This stainless steel exhaust system is meticulously crafted to replace the original exhaust system, enhancing both power and sound.

The heart of this system is its 4-inch diameter stainless steel piping, ensuring durability and resistance to corrosion. The design features a free-flowing muffler that minimizes back pressure, allowing the engine to breathe more efficiently and deliver improved horsepower and torque. Additionally, the system's large 3.5-inch diameter rear exit tips provide an aggressive and distinctive appearance, setting yourInfiniti M56 apart from the rest.

One of the key benefits of this Cat-Back Exhaust System is its significant reduction in weight compared to the stock exhaust. By utilizing lightweight stainless steel materials, the system sheds pounds, resulting in better acceleration and overall vehicle performance.

Moreover, the system's design allows for a split rear exit configuration, which not only adds visual appeal but also improves exhaust flow by reducing the length of the exhaust gases' path to exit the vehicle. This can lead to improved fuel efficiency and reduced exhaust temperatures.

Installing this Cat-Back Exhaust System is a straightforward process, as it is designed to fit directly onto your Infiniti M56 with no modifications required. The system comes complete with all necessary hardware and installation instructions, ensuring an easy and hassle-free installation experience.

In summary, the Stillen 504456 Cat-Back Exhaust System for Infiniti M56 models from 2011 to 2013 is a high-performance aftermarket solution that delivers improved power, sound, and a distinctive appearance. Made from durable stainless steel materials, this system is designed for longevity and resistance to corrosion. With its free-flowing design, split rear exit configuration, and straightforward installation process, this Cat-Back Exhaust System is an excellent choice for those seeking to enhance the performance and aesthetic appeal of their Infiniti M56.

Pros and Cons of Buying a Stillen 504456 Cat-Back Exhaust for Infiniti M56 (2011-2013) with Steel Cat-Back and Split Rear Exit

- Pro: The Stillen cat-back exhaust system enhances the vehicle's exhaust flow, leading to better engine performance and increased horsepower.

- Pro: This exhaust system provides a more aggressive and sporty exhaust note, which many enthusiasts find appealing.

- Pro: The split rear exit design not only looks stylish but also sets your Infiniti M56 apart from other stock vehicles.

- Pro: The steel construction ensures durability and resistance to corrosion, making it a long-lasting investment.

- Pro: Stillen is known for its high-quality parts, ensuring a proper fit and finish.

- Con: The Stillen cat-back exhaust system may be more expensive than some aftermarket alternatives.

- Con: Installing the exhaust system may require professional assistance, which comes with additional costs.

- Con: This exhaust system is not CARB (California Air Resources Board) compliant, which may be a concern for those in California or other states with similar regulations.

- Con: The exhaust system may be too loud for some drivers, potentially leading to noise complaints or drawing unwanted attention.

- Con: The performance improvements may result in a slight decrease in fuel economy.

- Con: The cat-back exhaust system may add some backpressure, which could impact the vehicle's overall performance and efficiency.

The Stillen 504456 cat-back exhaust system offers several advantages, including improved performance, enhanced sound, and a stylish design. However, it also comes with potential drawbacks, such as a higher price, the need for professional installation, and potential noise concerns.

If you're an Infiniti M56 enthusiast looking for a noticeable performance boost, a more aggressive exhaust note, and a visually appealing upgrade, the Stillen cat-back exhaust system might be worth the investment. Be prepared for the additional costs and potential noise concerns.

Alternatively, if you're on a budget, prefer a quieter exhaust, or live in a state with strict emissions regulations, you may want to explore other aftermarket exhaust options or stick with the stock system.

part # 504456 prices

• $1260.09-$1288.03

specifications frazzlekits:

• for makes: Infiniti
• for years: 2011-2013
• brand: Stillen
• brand type: Aftermarket Branded
• fitment type: Direct Replacement
• manufacturer part number: 504456
• upc: 600700003105
• california prop 65 warning: Cancer And Reproductive Harm.
• type: Cat Back
• department: Performance
• compatible model s : M56, Q70
• product type: Exhaust
• manufacturer warranty: Lifetime
• tip finish: Chrome / Polished
• product details: Performance Cat-back Exhaust System
• country of origin: United States
• product subtype: Exhaust Kits

seller frazzlekits:

• rating: 99.3%
• # reviews: 162227

returns frazzlekits:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer frazzlekits:

• started: June 12, 2026
• options: Ship-to-home
• quantity: 2
• sold: 0
• availability: In Stock

payments frazzlekits:

• other
• credit card: Discover
• wallet: Google-pay

shipping frazzlekits:

• transit: 4-8 Days
• class: Standard
• cost: $105.00
• carrier: FedEx
• service: FedEx Ground / FedEx Home Delivery
• type: Fixed

general frazzlekits:

• Car Truck Parts Accessories > Exhaust Emission Systems > Exhaust System Kits
• condition: New

Stillen 504456 Is Similar To:

• Stillen 504450 Infiniti Q50 16-24 Stainless Steel Cat Back Exhaust System Cf Tip (77.7% similar) $1748.71. (September 19th, 2024)
• Stillen 504204 For Hyundai Elantra N Cat Back Exhaust System Burnt Stainless Steel Tip (53% similar) $1356.56–$1596.49. (January 8th, 2025)
• Stillen 504397 For Nissan Maxima Rear Section Exhaust System 09-15 (48.4% similar) $665.16–$698.57. (March 8th, 2025)
• Stillen 508324 For Nissan Altima Axle Back Exhaust Carbon Fiber Tips 19-23 (43.8% similar) $915.10. (March 9th, 2025)
• Stillen 504445 For Infiniti M45 06-10 Stainless Steel Cat-back Exhaust System W Split Rear Exit (94.7% similar) $1165.81–$1201.89. (April 21st, 2025)
• Stillen 407730p For Infiniti G37 Sedan/q40 Supercharger Tuned System Polished 09-13 (51.7% similar) $227.91. (July 5th, 2025)
• Stillen 407735 For Infiniti G35 Sedan Supercharger Tuned System Satin 07-08 (54.1% similar) $7957.89–$8589.47. (July 6th, 2025)
• Stillen 105360 For Infiniti G35 Coupe Front License Plate Relocator 03-04 (47.6% similar) $55.00–$99.55. (July 7th, 2025)
• Stillen 407735b For Infiniti G35 Sedan Supercharger Tuned System Black 07-08 (53.8% similar) $8589.47. (September 3rd, 2025)
• Stillen Kb13145 Rear Diffuser Unpainted For 13-15 Nissan Altima (22.8% similar) $303.23–$363.06. (September 9th, 2025)
• Stillen 508275 Ss Axle-back Exhaust System For 08-13 Nissan Altima Coupe (49.1% similar) $602.05–$606.66. (November 3rd, 2025)