In stock form, the Audi A4 lineup spans roughly 190 hp in the base gasoline models to around 362 hp in the plug-in hybrid 55 TFSI e quattro, with the dedicated performance variant S4 delivering about 349 hp. For most buyers, the sweet spot sits in the mid-range gasoline versions, while the plug-in hybrid offers the highest factory power within the A4 family.
This article breaks down the horsepower across common configurations, explains what you can get from the factory today, and outlines what tuning and upgrades can achieve—along with important caveats about warranty, reliability, and daily drivability.
Stock horsepower by configuration
Below is a snapshot of typical factory outputs you’ll encounter in recent A4 generations and markets. Exact figures vary by year, trim, and region.
- Gasoline 2.0L turbo (base A4): roughly 190 hp in US-market cars, with higher outputs (up to about 261 hp) in European and newer models.
- Gasoline 2.0L turbo (higher-output variants, often branded 45 TFSI): up to about 261 hp in newer releases, depending on generation and market.
- Plug-in hybrid 55 TFSI e quattro: combined system output around 360–362 hp, with electric drive boosting acceleration and efficiency.
- S4 variant (3.0L TFSI V6): 349 hp in current generations, offered as the top-performing member of the A4 family (non-plug-in versions).
Numbers can differ by country and model year. If you’re shopping, check the exact spec sheet for your vehicle’s VIN to confirm horsepower for your build.
Aftermarket tuning and modifications
For those seeking more horsepower beyond stock, aftermarket options exist, but gains vary and can affect warranty, emissions, and long-term reliability. Here are common routes and typical ranges you might see.
- Stage 1 ECU remap (tune): commonly adds 20–80 hp, depending on engine, fuel, and supporting hardware.
- Intake and exhaust upgrades: generally yield about 5–30 hp, with larger gains when paired with a tune.
- Intercooler and turbo enhancements (where applicable): higher gains, often with supporting fuel and cooling upgrades.
- Major turbo or hybrid builds (non-factory): capable of substantial power increases (often 350–500+ hp) but require extensive hardware, tuning, and reliability planning.
Before modifying, consider warranty status, local emissions rules, insurance implications, and the potential impact on daily drivability. Work with reputable tuners and ensure that cooling, fueling, and drivetrain components are upgraded to handle any extra power.
What to consider before modifying
Modifications can dramatically change performance and cost. Beyond raw horsepower, think about fuel economy, daily usability, warranty coverage, resale value, and the risk of unintended consequences to safety systems and electronics.
Summary
Overall, the Audi A4 offers a broad power spectrum: base gasoline trims around 190 hp, higher-output gasoline variants up to roughly 261 hp, the plug-in hybrid 55 TFSI e quattro at about 362 hp, and the S4 at 349 hp. If you want the most horsepower in a stock A4, the 55 TFSI e quattro tops the lineup; for pure internal-combustion performance, the S4 is the strongest non-hybrid option. For more power beyond stock, aftermarket tuning is possible but requires careful planning and consideration of warranties, legality, and reliability.