2002–2005 Audi A4 1.8T Stage 2 ECU Tune (B6)

Unlock Real Power in Your 1.8T

Stop driving a detuned sleeper—it’s time to let your turbocharged 1.8T eat. With Boost Dynamic Tuning’s Stage 2 ECU calibration, your Audi transforms from mild to menacing, delivering the performance your B6 should’ve had from the factory.

Proven Dyno Results

• Stock (advertised): 180 HP / 173 TQ
• BDT Baseline Dyno: 175 WHP / 170 WTQ
• Stage 1 (reference): 245 WHP / 250 WTQ
• Stage 2 (BDT): 265 WHP / 285 WTQ

That’s a total gain of +90 WHP and +115 WTQ with supporting hardware—while preserving daily drivability and reliability.

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Stage 2 ECU Tune Features

• Increased horsepower & torque output
• Speed limiter removed; torque limiters raised
• Fueling optimized by throttle position
• Overrun crackles & pops (optional)
• Refined boost curve for smooth, linear delivery
• Reduced turbo lag with faster spool
• Raised LPFP & HPFP pressure
• Variable valve timing recalibration
• OBDII flash at home—no shop visit required
• Award-Winning 2-Step & No-Lift-Shift (NLS)
• Mafless tuning available
• Immobilizer delete available

Award-Winning 2-Step Launch Control

Our 2-step launch control is renowned for hard-hitting, true anti-lag punch. If you want rowdy, chest-thumping launches and serious noise, this is it.

Crackles & Pops (Overrun)

Add drama on demand. On high-RPM decel or free-rev, enjoy sharp pops and crackles—subtle with stock exhaust, wild with aftermarket setups.

Boost Control Optimization

Factory boost delivery is inconsistent. Our Stage 2 calibration targets:

• Quicker turbo spool & sharper throttle response
• Linear boost across the entire powerband
• Consistent acceleration in every gear

ECU Tune Modification Requirements

• Air Intake: Recommended
• Intercooler: Recommended
• Drivetrain Inserts: Recommended
• High-Flow Exhaust: Required
• Upgraded Diverter Valve: Required
• Spark Plugs: NGK BKR7EIX gapped to .028" (required)

Note: If you run an upgraded turbo (including K04), you’re not eligible for Stage 2. Please choose our Stage 3 ECU Tune.

Emissions Compliance Notice & Legal Disclaimer

FOR COMPETITION USE ONLY — NOT FOR STREET USE

This product is sold and intended solely for vehicles used in closed-course racing, off-road competition, or organized motorsport events. It is not legal for use on any pollution-controlled vehicle operated on public roads or highways, as defined under the Clean Air Act (42 U.S.C. § 7522) and applicable state emissions laws.

Federal and State Emissions Compliance

• May modify or render inoperative emissions controls (e.g., catalytic converters, O₂ sensors, EGR, OBD monitors).
• Installation/use on emissions-regulated vehicles is prohibited by federal law and may result in civil or criminal penalties (up to $45,000 per vehicle).
• Not certified by EPA or CARB and not legal for sale or use in California or CARB-aligned states.

The U.S. Environmental Protection Agency has enforcement authority under the Clean Air Act to pursue manufacturers, sellers, installers, and end-users of defeat devices.

Assumption of Risk & Waiver of Liability

• You assume all responsibility for legal compliance.
• You waive claims, liabilities, and legal actions against Boost Dynamic Tuning, LLC for any unlawful use.
• You release Boost Dynamic Tuning, LLC from damages, injuries, or penalties resulting from improper or unlawful use.

⚖️ Indemnification Clause

You agree to indemnify, defend, and hold harmless Boost Dynamic Tuning, LLC from fines, penalties, damages, losses, or legal fees resulting from misuse, misrepresentation of vehicle use, or violation of emissions laws.

Final Notice

Sold “as is” and “with all faults,” with no warranties—express or implied—regarding legality for public highway use or emissions compliance. It is the sole responsibility of the end-user to determine legality for the intended application. Boost Dynamic Tuning, LLC does not condone or recommend illegal street use or emissions equipment tampering.