Cat-Back Exhaust Sound and Fit for Mustang and Audi Q5
By MagnaFlow Exhaust, Mufflers & Cat Converters - Quality | Published: 2026-10-20
Category: Product Reviews
Learn how to choose and install a cat-back exhaust for your Mustang or Audi Q5. We cover sound expectations, fitment checks, and step-by-step installation tips.
Quick Answer
For a balanced upgrade, choose a cat-back system that matches your vehicle's engine and your sound preference. The MagnaFlow Street Series for the Mustang and Touring Series for the Audi Q5 are solid options, but proper fitment checks and installation steps are key.
Sound Differences: Street vs. Touring Series
The sound of a cat-back system depends on the muffler design and pipe diameter. The MagnaFlow Street Series for the Mustang uses straight-through mufflers and 3-inch mandrel-bent piping, producing a resonant, powerful tone that suits a performance-oriented driving style. The Touring Series for the Audi Q5 is engineered for a powerful yet refined note, better for long drives and daily commuting.
Your choice should reflect how you use the vehicle. If you want an aggressive exhaust note and track-style performance, the Street Series is a better fit. For a more subtle enhancement that doesn't drone on the highway, the Touring Series is the way to go.
Fitment Considerations Before You Buy
Cat-back systems are vehicle-specific. The MagnaFlow system for the 2011-2012 Mustang 5.0L/5.4L is designed to bolt directly to the factory catalytic converters. The Audi Q5 system is for the 2014-2017 3.0L model. Always confirm your vehicle's year, engine, and configuration before ordering.
Check if the system includes all necessary hardware and gaskets. Some systems may require additional parts like hangers or clamps. If you're unsure, consult the product description or contact support.
Step-by-Step Installation Guide
- Prepare Your Workspace and Vehicle: Park on a level surface, let the exhaust cool completely, and gather tools: jack stands, socket set, penetrating oil, and safety glasses. Disconnect the battery to avoid any electrical issues. Never work on a hot exhaust system; burns are a common injury.
- Remove the Factory Cat-Back System: Spray penetrating oil on the bolts and hangers. Loosen the clamps at the catalytic converter connection and the hanger bolts. Carefully slide the old system off, supporting it to avoid damage. If bolts are rusted, use a breaker bar and patience; don't force it and risk stripping.
- Inspect the Flanges and Gaskets: Clean the mounting flanges and check the condition of the gasket. Replace if worn. Ensure the flange surface is smooth to prevent leaks. A new gasket is cheap insurance against exhaust leaks.
- Install the New Cat-Back System: Position the new system components loosely, starting from the front. Slide the pipes together and hand-tighten the clamps. Attach the hangers to the rubber mounts. Do not fully tighten yet. Leave all clamps loose until the entire system is aligned.
- Align and Tighten All Connections: Adjust the pipes so they have equal clearance from the underbody and the tips are centered in the bumper cutouts. Tighten all clamps and hangers to the manufacturer's torque specs. Check for any contact with the chassis or suspension when the car is at normal ride height.
- Test for Leaks and Listen: Reconnect the battery, start the engine, and listen for any exhaust leaks at the joints. Check for unusual vibrations or rattles. Let the system warm up and check again. Small leaks can often be fixed by tightening clamps; persistent leaks may require a new gasket.
Product Facts
- MagnaFlow 2011-2012 Ford Mustang 5.4L / 2011-2012 Ford Mustang 5.0L Street Series Cat-Back Performance Exhaust System 15589: The MagnaFlow Ford Mustang Street Series Cat-Back uses 3-inch mandrel-bent piping and two straight-through mufflers with a dual split rear exit and 4-inch polished tips. This design maximizes exhaust flow and produces a resonant, powerful tone that enhances the Mustang's performance character.
MagnaFlow 2011-2012 Ford Mustang 5.4L / 2011-2012 Ford Mustang 5.0L Street Series Cat-Back Performance Exhaust System 15589 - MagnaFlow 2014-2017 Audi Q5 3.0L Touring Series Cat-Back Performance Exhaust System 15378: The MagnaFlow Audi Q5 Touring Series Cat-Back is made of corrosion-resistant stainless steel and is engineered for a powerful yet refined exhaust note. Stainless steel construction ensures durability over long miles, while the tuned sound keeps the cabin comfortable during daily drives.
MagnaFlow 2014-2017 Audi Q5 3.0L Touring Series Cat-Back Performance Exhaust System 15378
