The Audi S5, particularly the B8 and B8.5 generations equipped with the 3.0-liter TFSI V6 (supercharged from the factory), is a tuner's dream. While the factory supercharger provides a linear and responsive 333 horsepower, the aftermarket has unlocked a completely different level of performance. For roughly $6,000, an upgraded or fully realized supercharger system can push the S5 well past the 450 horsepower mark, delivering instant, visceral thrust that transforms the car's personality. This investment opens the door to a 500+ horsepower daily driver that retains all its luxury and refinement. Below, we break down everything you need to know about Audi S5 supercharger kits, from how they work to what they cost and which brands deliver the best results.

The Audi S5 3.0T: A Strong Foundation for Boost

Understanding why the S5 responds so well to supercharger upgrades requires a closer look at the engine itself. The 3.0-liter TFSI V6 (engine code CTUA/CTUB in the B8.5 and CWGD/CYFA in the B9) is a robust powerplant. It features a closed-deck design, forged steel crankshaft, and sintered connecting rods. This robust internal architecture allows the engine to handle significantly higher cylinder pressures than its naturally aspirated counterparts. The factory Eaton TVS Roots-type supercharger is efficient at low RPM but can become a heat pump and a restriction at higher airflow levels. This is where aftermarket kits step in. By either replacing the factory supercharger unit entirely or upgrading its components (pulleys, cooling, and inlet), aftermarket builders can double the boost pressure safely and reliably.

Factory vs. Aftermarket Supercharging

The factory supercharger setup is designed for a balance of fuel economy, emissions, and long-term reliability. It uses a smallish intercooler system and conservative engine management. Aftermarket kits, on the other hand, are engineered for maximum volumetric efficiency. They address the inherent bottlenecks of the factory system, namely intake air temperatures (IATs) and belt slip. Upgraded kits move to larger, more efficient supercharger units (like centrifugals) or significantly upgrade the factory twin-screw unit's supporting systems to allow for higher boost levels without detonation.

Supercharging vs. Turbocharging the S5

While turbocharging an S5 is possible and can yield massive peak power numbers, supercharging remains the preferred route for street-driven performance. A supercharger provides immediate throttle response because it is mechanically driven by the crankshaft. There is no lag waiting for exhaust gases to spool a turbine. This results in power that builds proportionally to engine RPM, mimicking a larger-displacement naturally aspirated engine. For daily driving, canyon carving, and track work, this linear, predictable power delivery is highly desirable. Turbochargers often require extensive fabrication (manifolds, downpipes, oil lines) which drives up cost and complexity, pushing a single turbo conversion into the $10,000-$15,000 range before supporting mods. Supercharging is a more straightforward, "bolton" path to significant power gains.

Anatomy of an Audi S5 Supercharger Kit

A complete supercharger kit is much more than just the blower itself. To safely support 100+ horsepower gains, the entire induction and fuel system must be upgraded. Here is what a comprehensive kit typically includes:

The Supercharger Unit

Centrifugal Superchargers: These are the most popular choice for big power gains on the 3.0T. Brands like Vortech and APR offer centrifugal systems. A centrifugal supercharger uses an impeller to draw air in and compress it radially. It produces exponential boost—building as RPM increases. They are highly efficient, generate less heat than a roots blower at high boost, and feature a self-contained oiling system so you don't need to tap into the engine's oil supply. Kits like the Vortech V3 or the APR CPS system are engineered specifically for the 3.0T's intake manifold and accessory drive.

Modified Twin-Screw/Roots Systems: The factory Eaton TVS supercharger is excellent. It can be upgraded with a smaller supercharger pulley (underdrive or overdrive) to increase boost pressure. However, simply adding a pulley without upgrading the intercooler and tuning is dangerous. Full bolt-on (FBO) setups often pair a dual-pulley upgrade (smaller crank pulley, smaller supercharger pulley) with larger heat exchangers and a throttle body spacer. This is a cost-effective way to gain 80-100 horsepower but typically tops out around 450-480 wheel horsepower.

Intercooling and Heat Management

Heat is the enemy of forced induction. A supercharger compresses air, which inherently heats it. Factory intercoolers (which are actually air-to-water heat exchangers) become heat-soaked quickly under sustained load. High-quality kits include a larger, more efficient heat exchanger, a higher-flow water pump, and an auxiliary reservoir. Some upgrade kits, like those from Awesome GTI or AWE Tuning, focus specifically on the intercooler system. Managing IATs is critical for maintaining consistent power and preventing engine knock.

Fuel System Upgrades

Adding 100+ horsepower requires more fuel. The factory high-pressure fuel pump (HPFP) and low-pressure fuel pump (LPFP) can run out of capacity. Most supercharger kits will mandate or strongly recommend an upgraded HPFP (often from APR or Autotech) or a lower-pressure fuel pump upgrade to supply the necessary volume for higher-boost applications. Larger fuel injectors are also a common requirement for E85 or high ethanol content blends.

Leading Audi S5 Supercharger Kits Compared

The market for the 3.0T is well-established. Here are the top contenders for a $6,000-$8,000 budget.

APR CPS (Centrifugal Supercharger System)

APR is a titan in the Volkswagen Audi Group (VAG) tuning world. Their CPS system for the 3.0T is a top-tier unit. It utilizes a Vortech V3-series compressor mated to a custom cast intake manifold and aluminum charge piping. The system includes a massive intercooler and a dedicated oil reservoir. APR provides their own engine management software with maps for 91 octane, 93 octane, and 100 octane. They also offer a CARB EO number for street legality in California, which adds value. This kit is known for its refined fitment, consistent power delivery, and exceptional tunability. It is the "buy once, cry once" solution for the serious enthusiast.

Vortech V3 Supercharger Kit

Vortech's direct bolt-on kit for the Audi S5 is a fantastic option. The V3 is a self-contained, gear-driven centrifugal unit that is whisper-quiet in operation. It comes with a high-flow intake, charge cooler, and all necessary hardware. Vortech kits are often modular, allowing owners to start with a base kit and later add larger intercoolers or pulley upgrades. The Vortech V3 Si-Trim is a popular model, capable of pushing the 3.0T to 500+ wheel horsepower with the right supporting fuel mods. Its reputation for reliability is stellar, making it a favorite for daily drivers seeking high performance.

PES (RPM Motorsports) Supercharger System

PES Racing was an early innovator for the 3.0T platform, offering a serious twin-screw replacement. While APR and Vortech dominate the centrifugal market, PES focused on a massive twin-screw unit that replaces the factory supercharger. The benefit of a twin-screw (Lysholm) supercharger is immense low-end torque. It provides instant boost off-idle, making the car feel incredibly responsive in city driving. However, these kits are harder to find now and typically require significant custom tuning. They are a niche option for those chasing low-RPM power and do not want the peak-RPM rush of a centrifugal.

The Real Cost Breakdown: $6,000 is the Starting Point

The headline figure of $6,000 often refers to the supercharger hardware itself. A realistic budget must account for the supporting mods.

Kit Pricing

  • Centrifugal Kit (APR/Vortech): $5,500 - $7,500
  • Twin-Screw Conversion (PES): $6,000 - $8,000 (used marketplace)
  • Pulley & Tune (Entry Level): $1,000 - $2,000

Installation & Labor

Installing a supercharger kit is an advanced mechanical project. Expect 10-15 hours of labor for a shop that knows 3.0T vehicles. At $100-$150 per hour, this adds $1,000 - $2,250. DIY installation is possible with a well-equipped garage and a helper, but it requires pulling the front bumper, radiator, and accessory drive components.

Supporting Modifications

  • Hardware Kit (Gaskets, Fluids, Belts): $200 - $400
  • Upgraded Heat Exchanger/Intercooler: $800 - $1,200
  • High-Pressure Fuel Pump (HPFP): $700 - $1,000
  • Colder Spark Plugs (Iridium): $60 - $120
  • DSG/Clutch Upgrade (for high torque): $1,200 - $3,000 (if applicable)
  • Custom Dyno Tuning (beyond base file): $500 - $800

Total realistic cost for a reliable 500+ HP setup: $8,500 - $12,000.

Installation Walkthrough and Considerations

Installing a supercharger kit on an Audi S5 is a significant undertaking, but it is a well-documented procedure for these vehicles.

Professional Installation vs. DIY

Professional installation is highly recommended unless you have extensive experience with European engine bay mechanics. The 3.0T engine bay is tight. A professional shop will have the specialized tools (tool for holding the harmonic balancer, torque wrenches, vacuum pump for recharging the A/C system if it needs to be moved). They can also handle the initial startup and data logging to ensure the tune is running correctly.

DIY Installation can save $1,500-$2,000. Most kits come with excellent instructions. The basic process involves: draining coolant, removing the front bumper support, removing the factory intake and heat exchanger, installing the new supercharger bracket and blower, mounting the intercooler, running charge pipes, connecting oil lines and coolant lines, and installing the injectors and fuel pump. It typically takes a full weekend (15-20 hours) for an experienced home mechanic.

Software and Tuning

This is the most critical component. Simply bolting on a supercharger without proper engine management will destroy the engine. The ECU must be recalibrated for the increased airflow, fuel pressure, and ignition timing. APR and GIAC offer off-the-shelf (OTS) tunes specifically for their hardware. Vortech kits often pair with Unitronic or custom Remote Tuning (like EPL Tuning). A custom tune on a dyno is the gold standard, allowing the tuner to optimize timing and fuel curves for your specific local fuel quality and altitude.

Performance Expectations and Driving Experience

What does a $6,000+ supercharger kit actually feel like from the driver's seat?

0-60 MPH and Quarter-Mile Times

Stock B8.5 Audi S5s typically run 0-60 MPH in about 4.4 seconds and the quarter-mile in 12.8 seconds. With a quality supercharger kit and supporting mods, expect a dramatic shift:

  • Stage 1 Pulley/Tune: 0-60 in 3.8 seconds, Quarter-mile in 12.2 seconds
  • Centrifugal Kit (APR/Vortech Stage 2): 0-60 in 3.5 seconds, Quarter-mile in 11.7 seconds
  • Stage 2+ (with fueling): 0-60 in 3.3 seconds, Quarter-mile in 11.4 seconds (trap speeds over 120 mph)

These are supercar numbers from a daily-driven luxury coupe. The acceleration is linear and relentless. The centrifugal supercharger's pull to redline is intoxicating, providing a rush that keeps building as the tachometer sweeps past 4,000 RPM.

Throttle Response and Power Delivery

Unlike a turbo car that may have a lag spike, the supercharged S5 feels naturally aspirated, but with immense torque everywhere. Blip the throttle at 2,500 RPM and the car surges forward. This makes merging onto freeways and passing traffic effortless. The immediate response also makes the car feel lighter and more agile. It transforms the S5 from a quick luxury car into a genuine high-performance weapon.

Reliability and Long-Term Ownership

This is the most critical question for any enthusiast. Can a supercharged Audi S5 go 100,000 miles? Yes, if it is built and maintained properly.

Key Maintenance Practices

  • Frequent Oil Changes: Change the oil every 3,000-4,000 miles using a high-quality 5W-40 synthetic. Forced induction stresses the oil, and fuel dilution (common in direct injection engines) must be managed. The supercharger itself (if centrifugal) has its own oil reservoir that should be changed every 2-3 years.
  • Spark Plug Intervals: Reduce the replacement interval to 15,000-20,000 miles. Use one to two steps colder spark plugs. Incorrectly gapped plugs cause misfires under high boost.
  • Belt Inspection: The supercharger drive belt works harder. Inspect it every oil change for glazing, cracking, or fraying. Tensioners should be replaced proactively.
  • Cooling System: Bleed the cooling system annually and replace the coolant mixture. Monitor IATs via your tuning software. If IATs climb above 140°F, consider a larger heat exchanger or auxiliary water/methanol injection.

Common Pitfalls

PCV System: The factory PCV system is a weak point on the 3.0T. Under boost, the PCV can fail, causing high crankcase pressure and oil leaks. Installing a catch can is mandatory for supercharged cars. It prevents oil vapor from entering the intake tract, which lowers the octane rating of the fuel mixture and causes detonation.

Fuel Trims: Always monitor your long-term fuel trims. If they exceed +/- 10%, you are running out of fuel pump capacity, which is a direct path to a lean condition and engine failure. An upgraded HPFP is the standard cure.

Is a Supercharger Kit Worth It?

For the driving enthusiast who owns an Audi S5, a supercharger kit represents the single best performance modification available. It completely unlocks the potential of the 3.0T engine, transforming a competent sport sedan into a legitimate powerhouse capable of embarrassing cars costing three times as much. The initial investment of around $6,000 for the hardware is significant, but the resulting smile-per-dollar ratio is incredibly high. When you combine the instantaneous power, the aggressive supercharger whine, and the ability to confidently merge into highway traffic, the value proposition becomes clear. It is a mature, well-supported modification that, when done correctly with proper supporting mods and maintenance, provides years of reliable, exhilarating performance.