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:
Adding to cart… The item has been added
Boost Dynamic Tuning

Audi A4 / A5 45 TFSI B9.5 ECU Tune

Real Numbers. Real Pulls.

Tap a stage — power, fuel, and required mods at a glance. Wheel numbers with crank estimates; every stage's dyno session is on video below.

Horsepower283WHP325 HP crank est.
Torque299WTQ344 TQ crank est.
Fuel: 91/93 octaneRequired mods: none — stock hardwareData: peaks dyno-verified
Horsepower300WHP345 HP crank est.
Torque300WTQstock 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
Horsepower320WHP368 HP crank est.
Torque346WTQwith high-flow exhaust
Fuel: 93 octaneRequired mods: high-flow exhaustData: peaks dyno-verified
Horsepower350WHP402 HP crank est.
Torque390WTQfull send
Fuel: Full E85Required mods: high-flow exhaust + intercoolerData: peaks dyno-verified

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 ExhaustREQREQ
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.

 

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.