2021 - 2025 MILD HYBRID Audi 45 TFSI B9.5 A4 A5 2.0t ECU PERFORMANCE TUNE

Availability:
Usually ships in 24 hours
$799.99
(11 reviews)
Width:
7.00 (in)
Height:
1.00 (in)
Depth:
7.00 (in)
Current Stock:
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Software Product — No Vehicle IncludedThis listing is an ECU calibration file and remote flashing service for the vehicle listed above. Boost Dynamic Tuning does not sell, broker, or supply motor vehicles. Vehicle names, model years and photographs are used solely to identify which car this software is compatible with.

Pick Your Stage

Every figure here is wheel horsepower from a filmed pull on our AWD dyno in a mild-hybrid B9.5 45 TFSI, with the crank estimate noted. Tap a stage to select it and jump to checkout.

Stage 1
283WHP
325 HP · 344 TQ crank est.
91/93 octane · no hardware required
Select & Buy
Stage 1+
302WHP
345 HP crank est. · stock hardware
93 octane · no hardware required
Select & Buy
Stage 1+ E85
330WHP
380 HP crank est. · ethanol torque
E85 · no hardware required
Select & Buy
Stage 2
319WHP
368 HP crank est.
93 octane · high-flow exhaust
Select & Buy
Stage 2+ E85
349WHP
402 HP crank est. · full send
Full E85 · high-flow exhaust & intercooler
Select & Buy

Stage 1 and Stage 1+ run on a completely stock car. Stage 2 wants a high-flow exhaust, and the E85 stages want real ethanol in the tank — text us your build and we’ll tell you straight.

Boost Dynamic Tuning

Audi A4 / A5 45 TFSI B9.5 ECU Tune

Choose Your Stage & Get Tuned →
Stock file saved before we write · Flash back to factory free, any time · Remote OBDII flash from your driveway

Real Numbers. Real Pulls.

Tap a stage — power, fuel, and required mods at a glance. Wheel numbers straight off our DynoLog sheets — the chart draws every stage against stock, and every stage's dyno session is on video below.

Horsepower282.9WHP325 HP crank est.
Torque299.4WTQ344 TQ crank est.
Fuel: 91/93 octaneRequired mods: none — stock hardwareData: peaks dyno-verified
Horsepower302.3WHP345 HP crank est.
Torque300.1WTQstock hardware
Fuel: 93 octaneRequired mods: none — stock hardwareData: peaks dyno-verified
Horsepower330WHP380 HP crank est.
Torque367WTQethanol torque
Fuel: E85Required mods: none — stock hardwareData: peaks dyno-verified
Horsepower318.9WHP368 HP crank est.
Torque342.4WTQwith high-flow exhaust
Fuel: 93 octaneRequired mods: high-flow exhaustData: peaks dyno-verified
Horsepower348.5WHP402 HP crank est.
Torque386.6WTQfull send
Fuel: Full E85Required mods: high-flow exhaust + intercoolerData: peaks dyno-verified
100200300400500200030004000500060007000
Stock baseline — 263.5 WHP / 269.1 WTQSTAGE 1 OUTPUT — 282.9 WHP / 299.4 WTQSTAGE 1+ OUTPUT — 302.3 WHP / 300.1 WTQSTAGE 1+ E85 OUTPUT — 330 WHP / 367 WTQSTAGE 2 OUTPUT — 318.9 WHP / 342.4 WTQSTAGE 2+ E85 OUTPUT — 348.5 WHP / 386.6 WTQ

If your tuner doesn't show before & after dyno videos, you're being lied to.

A dynamometer is a before-and-after measuring tool — not an absolute output number. What can't be faked is the delta: same platform, same dyno, stock vs tuned — on camera, in the videos below.

 

How It Works — Remote Tune

No shop visit. We flash your A4 / A5 over the internet while you watch it happen live on your screen.

1

Schedule — after purchase, book your remote flash session with BDT.

2

Set Up — Windows laptop with TeamViewer, our OBDII cable in the port, battery maintainer on the car, key in accessory.

3

We Flash It — BDT remotes into the laptop and runs the whole flash while you watch live.

4

Drive — key off on command, unplug, done. A few fault codes right after flashing are normal; they clear after a short drive cycle.

This ECU family flashes via a live BDT remote session. Self-flashing with the BDT Flasher lands when this platform is ported.

What's Included

Optimized Boost & TorqueDelivery dialed across every stage
IAT Safety AlertDash warning when you are pushing heat too hard
Crackles — Dynamic ModeLow / Medium / Intense-Flames, all stages
Speed Limiter RemovedFactory Vmax restriction deleted
Torque + Load Limiters RaisedFactory caps lifted for full delivery
Raised Rev Limiter (N/P)Neutral / Park rev limit raised
True E85 StagesStage 1+ E85 and Stage 2+ E85 calibrations
Remote OBDII FlashFlashed from home over a live BDT session

Watch The Proof

Every stage on the rollers, the JB4 comparison, and real customers. Sound on.

Dyno Session — Stage 1

Dyno Session — Stage 1+

Dyno Session — Stage 2

Dyno Session — Stage 2+ E85

BDT Stage 2 vs JB4 Stage 2

Crackle Pops — B9.5

Customer Reviews — Live Call

Customer Supplied Video

 

What Your Car Needs, Per Stage

If it is not listed as required, the tune runs without it.

REQ Required before flashing REC Recommended Not needed
Part / UpgradeS1S1+S1+ E85S2S2+ E85
High-Flow Exhaust CTS B9.5 options: test pipehigh-flow catREQREQ
Intercooler Highly recommended from Stage 1+ E85 upRECRECRECRECREQ
Air IntakeRECRECRECRECREC
Drivetrain InsertsRECRECREC

TCU tune is not available on this platform. Final output varies with fuel quality, altitude, temperature, and vehicle health — BDT publishes live before/after runs for transparency.

Maintenance

Maintenance ItemInterval
SPARK PLUGS
NGK R7438-8 Racing Plugs
15-20K mi
OIL CHANGE
5W-40 Liqui Moly • OEM FILTER ONLY
5K mi
DSG / MANUAL TRANS FLUSH & FILTER
OEM only
30K mi
MAP SENSORS
OEM only • intake / before throttle body
80K mi
PCV ASSEMBLY80K mi
INJECTORS + CARBON CLEANING
Do them on time to avoid misfires, lean conditions, and long-term damage
85K mi

Late Policy: If you schedule an in-person flash and arrive late without notice, a $50 fee applies. Reschedules must be made at least 1 hour prior.

 

Your ECU Is Safe

Your stock file is savedWe read and archive your factory file before a single byte is written. You can flash back to stock at any time, free.
Verified writes, safe abortsEvery flash is checksum-verified. If the connection drops mid-write the process aborts safely and can be resumed — it does not leave your ECU half-written.
You talk to the calibrator11+ years of in-house VAG calibration. The person who built your file is the person on the phone — not a reseller passing on someone else’s tune.
Ready? Choose Your Stage →
Stock file saved before we write · Flash back to factory free, any time · Remote OBDII flash from your driveway

Reviews

  • 5
    Bang for your buck — launch control is addicting

    Posted by Mark M on Sep 8th 2025

    Very nice bang for ur buck tune! Definitely feel the difference, and runs without any problems. Launch control is addicting.

  • 5
    Top notch — power is unbelievable

    Posted by Eric Jenkins on Sep 24th 2024

    Boost Dynamics is top notch. Worked through the kinks until car was running flawlessly. Power is unbelievable. Can't wait for the TCU tune to come available.