2021 - 2025 MILD HYBRID Audi 45 TFSI B9.5 A5 A4 2.0t Stage 1+ (Remote Tune)
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2021 - 2025 MILD HYBRID Audi 45 TFSI B9.5 A5 A4 2.0t Stage 1+ (Remote Tune)

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$744 $559
(4 reviews)
Width:
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Height:
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Description

2021–2025 Audi A4 / A5 45 TFSI Stage 1+ ECU Tune (B9.5 Hybrid EA888)
Boost Dynamic Tuning • Remote OBDII Flash

B9.5 Hybrid ECU? Most Tuners Tap Out. We Don’t. 

USA-BASED SOLUTION HYBRID EA888 READY NO HARDWARE NEEDED REMOTE FLASHING

If you’re in a 2021+ A4 or A5 45 TFSI, you already know this platform is different. The B9.5 hybrid EA888 ECU strategy is a whole new animal — and yeah… most tuners still don’t have a working answer.

BDT does. This Stage 1+ calibration was built from scratch in-house and validated through real-world logging, street grind, and dyno work. No recycled files. No “close enough.” Just a tune that makes the car feel how Audi should’ve delivered it.

Expect harder pulls, cleaner boost, sharper throttle, and a torque curve that hits like a switch. Stock feels polite — Stage 1+ feels alive.

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FITMENT & COMPATIBILITY

  • Models: Audi A4 45 TFSI / Audi A5 45 TFSI
  • Years: 2021, 2022, 2023, 2024, 2025
  • Chassis: B9.5
  • Engine: Hybrid EA888 Gen 3 2.0T
  • Fuel: 91 or 93 Octane Pump Gas
  • Tuning Method: Remote OBDII Flash at Home
  • Hardware Required: None

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REAL-WORLD STAGE 1+ POWER GAINS

On 91–93 octane with BDT Stage 1+, you’re looking at: up to ~300 WHP / ~345 WTQ with an optimized hybrid torque/boost strategy that stays smooth and safe.

STAGE HORSEPOWER TORQUE
Stock 45 TFSI (Audi Advertised) 261 HP 273 TQ
Stock 45 TFSI (BDT Dyno) 255 WHP 255 WTQ
BDT Stage 1+ 45 TFSI ~300 WHP / ~345 HP ~300 WTQ / ~345 WTQ

Final output varies with fuel quality, altitude, temperature, and vehicle health.

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BDT STAGE 1+ HIGHLIGHTS

  • Boost control reworked for smoother spool and harder pulls
  • Torque limiters / load caps safely raised — the car finally uses what it has
  • Speed limiter removed
  • Sharper throttle + reduced turbo lag (you feel it immediately)
  • Raised rev limiter (Park)
  • LPFP & HPFP pressure optimization
  • VVT recalibration for stronger mid-range power
  • Dynamic-mode crackles/overrun (Low / Medium / Intense)
  • Stock boost gauge recalibrated for higher scaling
  • Intake Air Temperature safety alert built-in
  • Auto start/stop defaults OFF (still functional)
  • Flashable through OBDII — no shop, no downtime

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ECU TUNE MODIFICATION REQUIREMENTS

PART / UPGRADE REQUIRED RECOMMENDED / NOTES
TCU Tune — Not Available Yet (Stage 1+ is safe on stock TCU)
Air Intake —  
Intercooler — Highly Recommended especially in hot climates
High-Flow Exhaust — Not Compatible

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REMOTE FLASH AT HOME (OBDII)

No shop visit. No waiting around. You can flash from your driveway through the OBDII port — and we guide you start-to-finish.

Remote Tuning How-To

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FEATURE DEEP-DIVE

CRACKLE POPS / OVERRUN (DYNAMIC MODE ONLY)

We keep it classy in Comfort/Auto, and let Dynamic mode go feral. Dynamic crackles add controlled pops on decel/free-rev while keeping exhaust temps and safety logic in check.

Note: Effect is subtle on stock exhaust. Safety logic reduces crackle if exhaust temps climb.

BOOST CONTROL OPTIMIZATION

The hybrid ECU can feel inconsistent under load from the factory. We rebuild the strategy so you get:

  • Linear, predictable boost delivery
  • Faster throttle response
  • Consistent power across the full band

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MAINTENANCE & RELIABILITY NOTES

  • Run quality 91 or 93 octane only.
  • Stay current on plugs, coils, and oil service intervals.
  • If you drive aggressive in heat, an upgraded intercooler is strongly recommended.

MAINTENANCE SCHEDULE

IF YOU WANT YOUR CAR TO SURVIVE, THESE MUST BE DONE!

I want your car to stay healthy for years with this tune. These aren’t “nice to haves” — they’re based on what I’ve seen after tuning countless MQB cars over the last decade.

If you can’t afford the maintenance items below, please don’t tune your car yet. I’m not being harsh — I’m being straightforward so you don’t end up blaming the tune for issues caused by skipped maintenance.

Follow this guide and your car will reward you with reliable power.

MAINTENANCE SCHEDULE MILES
SPARK PLUGS
NGK R7438-8 Racing Plugs (Link)		 Every 15–20K
OIL CHANGE
5W-40 LIQUI MOLY
OIL FILTER = OEM ONLY		 Every 5K
DSG / MANUAL TRANS FLUSH & FILTER (OEM ONLY) 30K
MAP SENSORS (OEM ONLY) — Intake / Before TB 50K
PCV ASSEMBLY 50K
INJECTORS + CARBON CLEANING 65K

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FAQ

Q: Will this tune work on a stock car?
A: Yes — no hardware is required. Intake and intercooler upgrades are optional but recommended.

Q: Is a downpipe supported?
A: No. This hybrid platform is not compatible with downpipe tuning at this time.

Q: Do I need to visit a shop?
A: Nope. Flash from home through OBDII with remote support.

Q: What drive modes have crackles?
A: Dynamic mode only. Comfort/Auto stay refined and quiet.

Q: Is a TCU tune required?
A: No TCU tune is available right now; Stage 1+ is calibrated for the stock TCU safely.

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DYNO SESSION LIVE

CUSTOM REVIEWS + LIVE PHONE CHAT

 

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.

By purchasing, installing, or using this product, you explicitly acknowledge and agree to the following terms:

Federal and State Emissions Compliance

  • This product may modify, bypass, defeat, or render inoperative one or more emissions control devices, including but not limited to: catalytic converters, oxygen sensors, EGR systems, or OBD monitoring systems.
  • The installation or use of this product on any vehicle subject to emissions regulations is strictly prohibited by federal law</

Reviews

  • 5
    Audi A5

    Posted by Cullen W. on Nov 13th 2025

    Boost did an amazing job; great service. Love my car. Stage 1+ really picked it up. I’d recommend to anyone.

  • 5
    It's night and day differencel Best decision ever made

    Posted by Mike sablet on Oct 7th 2025

    The tune woke the car up I'm so happy with it it's so fast but when you want to drive chill it drives smooth feels like it's OEM it just drives so freaking fast now it's nice I'm happy I'm so happy the power is insane I feel like I could smoke a Mustang now it's hella good

  • 5
    Tune

    Posted by Brian on Sep 24th 2025

    Grabbed the Stage 1+ from BDT for my 2023 Audi A4 b9.5 and holy ****! The car feels like a completely different car, woke it right up and is a pleasure to drive. Im giddy walking to the parking lot after work because I get to daily drive over 300 whp. The launch throws you in your seat, and with an intake, it defiantly doesn't sound like a little 4 banger anymore. Cheers BDT team!

  • 5
    Remote Tune

    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