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The Audi B5 S4 is a beloved vehicle among enthusiasts, known for its performance and tuning potential. If you’re looking to boost your horsepower without breaking the bank, here are some of the best budget modifications that can help you add 50-70 horsepower for around $1,200 in parts. These modifications utilize both genuine Audi parts and quality aftermarket alternatives.
1. ECU Tune
The first step in increasing your B5 S4’s horsepower is to remap the engine’s ECU. A proper ECU tune can unlock significant power by optimizing fuel maps and ignition timing.
- Cost: Approximately $400-$600
- Power Gain: 30-50 HP
- Recommended Brands: APR, Unitronic, or Revo
2. Upgraded Diverter Valves
Upgrading the diverter valves is essential for maintaining boost pressure and improving throttle response. The stock valves can leak under higher boost levels, leading to performance loss.
- Cost: Around $150-$300
- Power Gain: 5-10 HP
- Recommended Brands: Forge Motorsport, 034Motorsport
3. High-Flow Air Filter
Replacing the factory air filter with a high-flow option allows for better airflow to the engine, which can increase power and improve throttle response.
- Cost: Approximately $50-$100
- Power Gain: 5-10 HP
- Recommended Brands: K&N, ITG
4. Cat-Back Exhaust System
A cat-back exhaust system enhances exhaust flow and can provide a more aggressive sound. This modification not only improves performance but also gives your B5 S4 a sportier presence.
- Cost: Around $600-$800
- Power Gain: 10-15 HP
- Recommended Brands: Milltek, Borla, or AWE Tuning
5. Upgraded Intercooler
An upgraded intercooler helps lower intake temperatures, allowing for denser air and more power. This is especially important if you plan to run higher boost levels.
- Cost: Approximately $300-$500
- Power Gain: 10-20 HP
- Recommended Brands: 034Motorsport, ECS Tuning
6. Boost Control Valve
A boost control valve allows for better management of boost levels, ensuring you get the most out of your turbochargers. This can lead to improved performance and responsiveness.
- Cost: Around $100-$200
- Power Gain: 5-10 HP
- Recommended Brands: Forge Motorsport, APR
7. Lightweight Flywheel
A lightweight flywheel reduces rotational mass, allowing the engine to rev more freely. This can enhance acceleration and overall engine responsiveness.
- Cost: Approximately $400-$600
- Power Gain: 5-10 HP
- Recommended Brands: South Bend, SPEC
Conclusion
With these modifications, you can significantly enhance the performance of your B5 S4 while staying within a reasonable budget. By investing around $1,200 in parts, you can achieve a power increase of 50-70 HP, making your driving experience even more thrilling. Always remember to consider professional installation and tuning for optimal results.