The AWE Tuning Stage 2 Kit for the Audi S5 3.0T stands as one of the most thoroughly engineered bolt-on performance packages available for this platform. Designed to unlock substantial horsepower gains while retaining the refinement and daily usability that Audi owners expect, this kit represents a significant step beyond factory specifications. With an advertised increase of over 80 horsepower and a complete installation price of $2,500, the Stage 2 Kit aims to deliver a transformative driving experience without the headaches often associated with piecemeal modifications.

What’s Included in the AWE Tuning Stage 2 Kit?

The Stage 2 Kit is not a collection of random parts; it is an integrated system where each component is engineered to work in concert with the others. AWE Tuning has carefully selected and calibrated each element to maximize performance, reliability, and sound quality. Here is a detailed look at what arrives in the box.

High-Performance ECU Tune

At the heart of the kit is a custom ECU calibration developed specifically for the 3.0L supercharged V6 found in the B8.5 Audi S5 and related models. The tune optimizes ignition timing, air-fuel ratios, boost pressure (via the supercharger bypass valve), and throttle mapping. Unlike generic off-the-shelf tunes, AWE’s calibration is tailored to the exact hardware in the kit, ensuring seamless integration and consistent power delivery. The tune is flashed directly through the OBD-II port using AWE’s own software, leaving no permanent traces and allowing for easy returns to stock if needed.

Upgraded Downpipes

The included downpipes are a critical component for stage 2 performance. Factory downpipes are restrictive, particularly the catalytic converters, which create a bottleneck as exhaust flow increases. AWE’s downpipes are constructed from 304 stainless steel and feature high-flow catalytic converters that reduce backpressure while still maintaining emissions compliance in many regions. The mandrel-bent tubing ensures smooth exhaust flow, and the flanges are precision-machined for a leak-free fit. These downpipes bolt directly to the stock turbocharger outlets and replace the restrictive factory units.

Enhanced Intake System

To feed the engine with cooler, denser air, the kit includes AWE’s closed-airbox intake system. This intake uses a large, high-flow cotton filter housed in a sealed carbon fiber or ABS plastic box that draws air from the front of the vehicle. The design minimizes heat soak and reduces intake air temperatures compared to open-element intakes. The intake also incorporates a smooth, mandrel-bent aluminum tube that replaces the convoluted factory intake path, reducing turbulence and pressure drop. The result is a noticeable increase in intake noise and throttle response.

Performance Exhaust System

AWE’s Touring Edition exhaust is a cornerstone of the Stage 2 package. This cat-back system features a 3-inch main pipe that splits into two 2.5-inch tailpipes. It uses AWE’s patented drone-canceling 180-degree technology, which strategically uses sound waves to eliminate unwanted resonance inside the cabin. The exhaust is available with either polished or diamond-black tips and can be paired with AWE’s optional SwitchPath™ valve system for those who want the ability to toggle between quiet and aggressive modes. The exhaust adds a deep, refined tone under load without being obtrusive during cruising.

Custom Hardware and Fittings

Every gasket, clamp, and fastener needed for installation is included. AWE provides pre-installed oxygen sensor bungs on the downpipes, Viton O-rings for leak-free connections, and all necessary hardware to mount the intake and exhaust. The kit also includes detailed instructions and access to AWE’s technical support team.

Performance Gains and Driving Experience

AWE Tuning publishes verified dyno results for the Stage 2 Kit, showing gains of 80–90 horsepower at the wheels on a stock Audi S5 3.0T. Torque increases similarly, with a broad plateau that peaks around 3,500–5,000 RPM. The power gain is not just a peak number; the entire curve rises, meaning the car pulls harder from low RPMs all the way to redline.

Throttle response sharpens noticeably. The recalibrated ECU reduces the factory’s deliberate lag between pedal input and throttle opening, making the car feel more immediate. The enhanced intake and exhaust also reduce turbo lag (though the supercharged engine has minimal lag anyway) and improve the engine’s willingness to rev. Owners report that the car becomes more engaging to drive, with a soundtrack that matches the performance level.

In real-world terms, the Stage 2 kit can drop 0–60 mph times by 0.5–0.7 seconds, depending on traction conditions. Quarter-mile times improve by several tenths and trap speeds increase by 4–6 mph. The car retains its everyday civility: start-up is not louder than stock except for a brief cold-start activation, and at highway cruising speeds the exhaust is nearly silent inside the cabin thanks to the 180-degree technology.

Installation Process Overview

While the kit is designed for a straightforward bolt-on installation, AWE recommends professional installation to ensure every component is correctly aligned and sealed. The process typically takes 4–6 hours for an experienced shop. Here is a general outline of the steps:

  1. Remove the factory intake, downpipes, and exhaust system. This requires lifting the vehicle and disconnecting various sensors and hangers.
  2. Install the new downpipes, ensuring the oxygen sensors are transferred and the high-flow cats are properly oriented.
  3. Mount the intake system, securing the airbox and connecting the intake tube to the throttle body.
  4. Install the cat-back exhaust system, tightening all clamps and hangers to specification.
  5. Flash the ECU with the Stage 2 tune using AWE’s software and a battery charger to maintain voltage.
  6. Perform a thorough leak check and test drive to verify performance and proper operation.

The only special tool required for most installations is a set of O2 sensor sockets and a torque wrench. The ECU flash is done via a laptop connected to the OBD-II port, and the process is reversible at any time.

Cost and Value Analysis

The $2,500 installed price is an all-in figure that includes the full kit components and labor. To put that in perspective: purchasing the intake, downpipes, exhaust, and tune separately would cost significantly more. AWE’s intake alone is ~$450, the downpipes ~$1,200, the exhaust ~$1,600, and a comparable tune ~$700, totaling well over $3,900 in parts before labor. The kit bundles everything at a discount and includes installation, saving the buyer roughly $1,500–$2,000 versus buying items individually and paying separate labor fees.

Compared to competitors like APR, 034Motorsport, Unitronic, and Integrated Engineering, the AWE Stage 2 kit is competitively priced. APR’s Stage 2 package for the same engine (including downpipes and tune but often without intake/exhaust) can cost $2,200–$2,800 for parts alone, and installation adds another $400–$800. AWE’s offering provides a finished, tested system with a single-source warranty. For owners who want a turnkey upgrade without piecing together parts from different brands, this kit represents excellent value.

Comparing Stage 2 to Stage 1 and Stage 2+

Understanding the progression helps buyers decide if Stage 2 is the right level.

Stage 1 is simply an ECU tune with no hardware changes. On the 3.0T supercharged engine, a Stage 1 tune typically yields 50–60 hp gains and costs around $600–$900. The car feels stronger but retains factory restrictions.

Stage 2 (as described) adds downpipes plus intake/exhaust hardware. This allows the tune to take full advantage of improved airflow, raising gains to 80–90 hp. The sound and throttle response are also significantly enhanced. This is the sweet spot for many owners because it delivers a dramatic improvement without requiring a supercharger pulley upgrade.

Stage 2+ (or Dual Pulley) goes further by installing a smaller supercharger crank pulley or larger SC pulley to increase boost. This adds another 30–40 hp but places greater stress on the engine and drivetrain. It also requires a heat exchanger upgrade and often a larger throttle body. AWE offers a Stage 2+ package that builds on the Stage 2 hardware, but it is not included in the base $2,500 kit. For daily-driven cars, Stage 2 is often the preferred choice for reliability reasons.

Reliability and Drivability

AWE Tuning has built a reputation for producing conservative, safe calibrations. The Stage 2 kit keeps boost levels within the factory supercharger’s safe operating range and does not push timing to the edge of knock. The engine retains its factory compression ratio, and the upgraded downpipes actually reduce exhaust gas temperatures by improving flow. The high-flow catalytic converters are durable and designed to last, and AWE provides a limited lifetime warranty on the hardware (excl. consumables).

Drivability remains excellent. The car starts and idles like stock, and cold-start emissions routines are preserved. There are no check engine lights caused by the tune, and the exhaust valves (if equipped with SwitchPath) operate normally. The only telltale signs are the deeper exhaust note and the immediate throttle response. For owners who use their S5 as a daily driver, the Stage 2 kit does not compromise comfort or reliability.

Is the AWE Tuning Stage 2 Kit Right for You?

This kit is ideal for Audi S5 3.0T owners who want a comprehensive performance upgrade without the hassle of sourcing parts from multiple vendors or dealing with incompatible hardware. It suits both daily drivers and weekend track cars, as the system is durable enough for sustained high-output use. Owners who plan to push beyond Stage 2+ can repurpose the intake and exhaust, making it a good foundation for future power increases.

However, those who only want a mild boost or are on a tight budget may be better served by a Stage 1 tune. Also, if you live in an area with strict emissions testing, verify that the high-flow catalytic converters will pass inspection—some states require CARB EO numbers. AWE’s downpipes are not CARB-approved, so check local regulations.

Final Verdict

The AWE Tuning Stage 2 Kit for the Audi S5 3.0T delivers exactly what it promises: a significant, reliable horsepower gain with an exceptional sound and improved drivability. At $2,500 installed, it is one of the most cost-effective ways to transform the character of the S5. The integration of components, the quality of the hardware, and the support from a respected aftermarket tuner make this kit a top recommendation for anyone ready to move beyond factory performance. Whether you are chasing quicker lap times or simply want a more exciting commute, the Stage 2 kit offers a complete, worry-free upgrade.

For more details, visit the official product page at AWE Tuning’s website. You can also read owner reviews on forums like Audizine and check independent dyno results from 034Motorsport for comparative data.