Description
Upgrade the performance and sound of your 5.6L V8 Infiniti M56 or Q70 with the STILLEN Near Cat-Back Exhaust System, engineered to deliver improved airflow, enhanced horsepower and torque, and a refined yet aggressive exhaust note that matches Infiniti’s luxury character.
Designed as a Near Cat-Back system, this exhaust replaces the rear sections of the factory exhaust while retaining excellent cabin comfort. Precision mandrel-bent tubing and premium stainless steel construction ensure long service life, perfect fitment, and consistent performance.
Vehicle Fitment
- 2011–2013 Infiniti M56 5.6L V8 (V51)
- 2014–2018 Infiniti Q70 5.6L V8 (V51)
- For 5.6L engines only
- For 3.7L models, see STILLEN part number 504437
Key Features & Benefits
- Horsepower Increase (WHP)
- Torque Gain
- Exhaust Tone: Mild at idle and cruising, aggressive under throttle
- Luxury-Friendly Sound Profile: Enhanced sound without excessive cabin noise
- Near Cat-Back Exhaust System: Improved flow while retaining refinement
- 304 Stainless Steel Construction: Mandrel-bent tubing for optimal exhaust flow
- Polished Stainless Steel Tips, End Pipes, and Mufflers
- Straight-Through Mufflers: Wrapped in Italian Granite Wool for durability and controlled sound
- Aggressive Appearance: Complements the factory rear exhaust cutouts
- Limited Lifetime Warranty
Driving Experience
At idle and during highway cruising, the exhaust remains refined and composed, preserving the premium cabin experience expected from the Infiniti M56 and Q70. Under throttle, the V8 comes alive with a deeper, more authoritative tone that enhances the driving experience without overwhelming it.
This system is ideal for drivers who want noticeable performance and sound improvements while maintaining a luxurious, quiet ride when desired.
Engineering & Construction
Each STILLEN Infiniti M-Series exhaust is constructed from 100% mandrel-bent tubing to maximize exhaust flow and reduce restrictions. The use of T304 polished stainless steel throughout ensures corrosion resistance, long-term durability, and a premium finish. The straight-through muffler design balances performance gains with responsible sound levels, making it suitable for both daily driving and spirited use.
