How the Awe Tuning Cat-back Exhaust System Boosts Audi Rs5 Performance by 15 Hp for $2,500

Overview: Elevating the Audi RS5 with an Exhaust Upgrade

The Audi RS5 (B9 generation, 2018-present) is already a formidable machine, packing a twin-turbo V6 that delivers 444 horsepower from the factory. Yet automotive enthusiasts know that even the best-engineered cars leave room for improvement—especially in the areas of exhaust flow and sound. One of the most popular aftermarket solutions for the RS5 is the AWE Tuning Cat-Back Exhaust System, which promises a 15-horsepower gain and a dramatically enhanced auditory experience for an investment of approximately $2,500. This article dives deep into the engineering, real-world performance, installation, and value of this upgrade, helping you decide if it’s the right modification for your RS5.

What Is a Cat-Back Exhaust and Why Does It Matter?

A "cat-back" exhaust system replaces the factory exhaust from the catalytic converters rearward to the exhaust tips. Unlike a full turbo-back system, a cat-back leaves the downpipes and catalytic converters in place, making it a simpler, more emission-friendly upgrade that still reduces restriction in the mid- and rear-section of the exhaust path.

How It Improves Performance

The factory exhaust on the Audi RS5 is designed for noise compliance and cost efficiency, resulting in multiple pinched sections and resonators that create backpressure. By swapping to a free-flowing cat-back system with larger-diameter, mandrel-bent tubing, the engine can expel exhaust gases more efficiently. This reduces pumping losses, allowing the turbochargers to spool more quickly and the engine to produce more horsepower and torque. The result is not just peak gains but also improved throttle response throughout the rev range.

AWE Tuning Engineering: Materials and Build Quality

AWE Tuning is known for its precision-crafted exhaust systems, and the RS5 cat-back is no exception. The system is constructed from T304L stainless steel, chosen for its corrosion resistance, strength, and ability to withstand high temperatures without discoloration. All piping is mandrel-bent, meaning the inside diameter remains consistent at every bend—no crimping or collapse that would restrict flow.

Unique Features of the AWE System

Drone-Canceling (180° Technology): AWE incorporates their patented 180-degree resonator design that cancels out low-frequency drone while preserving the aggressive growl. This makes the cabin quieter at highway cruising speeds than many competing systems.
Tip Options: Customers can choose from a range of tip finishes, including chrome silver, diamond black, or carbon fiber, to match or contrast with the car’s styling.
Modular Design: The system comes in two primary variants: the Touring Edition (with resonators for a refined but sporty note) and the Track Edition (straight-through, max volume and aggression). Both are available for the same $2,500 price point.
Weight Reduction: The AWE system saves approximately 10-12 lbs compared to the factory exhaust, contributing to a slight overall weight reduction.

Performance Gains: Claimed 15 HP vs. Real-World Results

AWE Tuning rates the cat-back exhaust at +15 horsepower at the crank for the Audi RS5 2.9T engine. Independent dyno testing by enthusiasts and tuning shops has typically validated this claim, often showing gains of 12–16 wheel horsepower (whp) and 10–15 lb-ft of torque on a completely stock RS5. When combined with a software tune, the exhaust amplifies the gains by allowing the engine to breathe more freely at higher power levels.

Dyno Test Example

One popular independent test conducted by ECS Tuning on a 2018 RS5 recorded a peak increase of 14.2 whp and 12.1 lb-ft of torque over the factory exhaust, with the torque curve showing improvements from 3,000 rpm all the way to redline. These real-world numbers closely match AWE’s claims, giving buyers confidence in the product.

It’s important to note that a cat-back exhaust alone will not generate massive grunt—the 15 hp figure is modest but meaningful when you consider the improved sound and weight savings also come standard.

Sound: Track vs. Touring Edition

The auditory transformation is perhaps the most immediate gratification of the AWE system. Audi RS5 owners consistently praise the deep, European growl that emerges under acceleration, accompanied by turbo spool sounds that were previously muted.

Differences Between Editions

Touring Edition: Equipped with AWE's drone-canceling 180-degree resonators. This edition provides a rich, full-bodied soundtrack that’s aggressive under load but nearly as quiet as stock when cruising. Ideal for daily drivers who want performance without fatigue.
Track Edition: Straight-through design, no resonators. This variant is significantly louder, with a raw, race-car-like bark under full throttle. Some owners report minor interior drone at certain RPMs, but most find it acceptable for a weekend toy or track car.

Sound clips are available on AWE’s official product page, where you can hear both versions to make an informed choice.

Installation Process: Straightforward but Requires Lifts

One of the appeals of the AWE cat-back is its bolt-on design—no cutting, welding, or modifications are required. The system uses factory-style hangers and clamps.

What You’ll Need

Vehicle raised on jack stands or a lift
Basic hand tools: sockets (13mm, 15mm), ratchet, extensions, flathead screwdriver for clamp removal
Penetrating oil for stubborn bolts
Approximately 1.5 to 2.5 hours for an experienced DIYer

Step-by-Step Overview

Remove the factory exhaust by unbolting the clamp at the mid-section joint, loosening the hangers, and sliding the system out from the rear.
Install the new system by hanging the AWE components on the rubber isolators. AWE provides clear instructions and all hardware.
Align the tips for symmetrical appearance, then tighten all clamps to the specified torque.
Check for leaks by starting the engine and inspecting connection points.

Most owners report no CEL (check engine light) issues, as the cat-back does not disturb oxygen sensors or catalytic converters. For those uncomfortable with under-car work, a local muffler shop can usually install the system for $100–$200 in labor.

Cost-Benefit Analysis: Is $2,500 Worth It?

At $2,495 (list price), the AWE Tuning cat-back sits in the mid- to upper-tier of exhaust prices for the RS5. Competitors like Akrapovic can cost $4,000+, while budget options from Borla or Milltek hover around $1,800–$2,200. So how does the AWE justify its price?

Value Proposition

Sound quality and drone control: The Touring Edition is widely considered the best-sounding conservative exhaust for the B9 RS5, with no annoying drone.
Proven performance gains: Consistent dyno results between 12-16 whp.
Build quality: T304L stainless steel, mandrel bends, and excellent welding.
Resale value: The system holds its value well; used units often sell for 60-70% of new price.
Emissions legal: Because it is a cat-back (not a downpipe), the system is 50-state legal and passes visual inspections in most areas.

In comparison to other modifications that yield similar power—like a carbon fiber intake ($600–$800 for ~5-10 hp) or a tune ($1,000 for ~50 hp)—the exhaust provides a unique combination of sound and power, plus a more tactile driving experience. For many owners, the emotional return of a superior exhaust note justifies the cost even more than the dyno numbers.

Competitor Comparison: AWE vs. Akrapovic vs. Milltek

To put the AWE system into context, here’s a brief comparison with two other popular cat-backs for the RS5:

Exhaust	Price (approx.)	Gain (whp)	Weight Savings	Sound Character
AWE Track/Touring	$2,495	12-16 whp	~11 lbs	Deep, aggressive; drone-free with Touring edition
Akrapovic Slip-On (Titanium)	$4,200	10-14 whp	~15 lbs	High-pitched, exotic; less deep than AWE
Milltek Non-Resonated	$1,895	10-12 whp	~6 lbs	Loud, raspy at high RPM; some drone

The AWE strikes a balance between price, performance, and sound refinement. Akrapovic offers lighter titanium construction but at nearly double the cost. Milltek is cheaper but typically offers slightly less power and more drone.

Customer Feedback and Real-World Reliability

Across forums like Audizine, AudiWorld, and Reddit’s r/Audi, the AWE cat-back for the RS5 enjoys a strongly positive reputation. Common praises include:

“Best sound for a daily-driven RS5 without annoying your neighbors.”
“Install was a breeze, fitment was perfect.”
“Noticeable difference in throttle response—feels like it wants to rev faster.”

Less common complaints: some Track Edition owners wish they had gone with the Touring after encountering drone on long highway trips. A small number of users reported that the clamps needed retightening after a few hundred miles (typical for any slip-fit exhaust).

Read a detailed owner review on Audizine for first-hand impressions.

Compatibility, Warranty, and Legal Notes

The AWE cat-back is designed specifically for the B9 Audi RS5 (2018-2023) with the 2.9L twin-turbo V6. It will not fit earlier RS5 models (B8.5, V8) or other Audi vehicles without modification. AWE offers a limited lifetime warranty for the original purchaser, covering material and workmanship defects.

Because the system does not delete any catalytic converters or change the downpipe, it is CARB-exempt and 50-state legal for use on public roads in all US states and Canada. Some track events may require sound limit checks; the Track Edition can push over 95 dB, so check local regulations.

Conclusion

The AWE Tuning Cat-Back Exhaust System represents a well-engineered upgrade for the Audi RS5, delivering a genuine 15 hp improvement, weight savings, and a choice of two distinct sound profiles—all for $2,500. Its drone-canceling technology, high-quality stainless steel construction, and straightforward installation make it a compelling option for anyone wanting to personalize their RS5 without compromising daily usability. While not the cheapest option on the market, the combination of proven performance, excellent fit and finish, and strong resale value positions it as a top-tier investment for discerning owners. Whether you choose the refined Touring Edition or the aggressive Track Edition, the AWE system will transform your RS5 into an even more thrilling machine.