Audi

Best First Mods for Audi S5 B9 (2017–2023) – Build it Right

The Audi S5 B9 (2017–2023) is sleek, sharp, and built with turbocharged potential. With the new 3.0L turbo V6 (EA839), Audi ditched…

The Audi S5 B9 (2017–2023) is sleek, sharp, and built with turbocharged potential. With the new 3.0L turbo V6 (EA839), Audi ditched the supercharger from the B8.5 — but gave us something even more tunable. Stock, it’s quick. But with a few smart upgrades? You’re walking M340is, C43s, and maybe even sneaking up on RS5s.

In this full breakdown, we’re dropping the Best First Mods for Audi S5 B9, focused on real gains, daily reliability, and upgrades that make the biggest difference right away.

A. Intake System – Free the Turbo Sound and Flow

The factory airbox strangles both performance and sound. Once you go aftermarket, the difference is immediate.

Why it’s a must-do:

  • Adds 10–20 hp
  • Enhances turbo spool and blow-off sound
  • Reduces turbo lag
  • Essential for tuning

✅ CTS Turbo Intake for Audi S5 B9 – Amazon
✅ AliExpress High-Flow Intake Options
✅ Best B9 Intakes – GermanCarMods.com

The EA839 engine breathes way better with a quality intake. Combine it with a tune and the boost hits way harder, way earlier.

B. Stage 1 Tune – The Real Power Begins Here

Audi’s factory calibration leaves a ton on the table. The second you flash a Stage 1 tune, your S5 turns into a whole new car.

Gains you can expect:

  • +70 to +100 hp
  • Massive torque bump (up to 500+ lb-ft)
  • Sharper throttle response
  • Higher redline and boost targets

✅ Integrated Engineering ECU Tune
✅ 034Motorsport Stage 1 Flash
✅ [APR and EQT Tunes Also Available]

This is easily one of the best first mods for Audi S5 B9 — dollar-for-dollar, it’s unmatched in performance gain.

C. Downpipe + Exhaust – Sound, Flow, Performance

The B9 S5 sounds tame from the factory. You’ll want more growl — and better flow.

Options to consider:

  • Resonator/muffler delete – Cheap, aggressive
  • Cat-back system – Deep tone, clean fitment
  • High-flow downpipe – Power boost, especially when tuned

✅ AWE Touring Cat-Back – Amazon
✅ AliExpress Quad Tip Kits + Downpipes
✅ Full Exhaust Guide – GermanCarMods.com

Sound transforms the driving experience. This isn’t just for show — it completes the power setup.

D. Lowering Springs or Coilovers – Eliminate the Gap

Stock ride height is weak. You want a flush, aggressive stance that still rides smooth.

Two great options:

  • Eibach Pro-Kit Springs – Mild drop, comfort
  • KW V1 Coilovers – Fully adjustable, better handling

✅ Eibach Springs – Amazon
✅ KW/ST Coilover Kits – AliExpress

Lowering changes the look and feel of your car overnight — it’s one of the best first mods for Audi S5 B9 if you want form and function.

E. RS5-Style Grille – The Instant Front-End Upgrade

This is the face of your car. And the factory grille is… boring.

The RS5-style honeycomb mesh grille:

  • Looks more aggressive
  • Adds black or carbon contrast
  • Costs under $200 in most cases

✅ RS Grille Kit – Amazon
✅ Honeycomb Front Grilles – AliExpress
✅ Visual Mods Guide – GermanCarMods.com

Throw in a black badge and delete the plate holder for a true RS-style face.

F. LED Headlights and Sequential Taillights – Bring the Audi Look to Life

Factory lights get the job done — but aftermarket LED upgrades give you the premium Audi vibe.

  • LED DRL animation headlights
  • Smoked sequential taillights
  • Dynamic turn signals

✅ VLAND Lighting Kits – Amazon
✅ Sequential LED Tail Kits – AliExpress

Lighting matters — especially at night. One of the best visual upgrades you’ll see every single drive.

G. Paddle Extensions + CarPlay Upgrade – Dial In the Cabin

The B9 interior is already solid. But small tweaks take it to the next level:

  • Aluminum paddle shifter extensions – race feel
  • Wireless CarPlay/Android Auto – modern tech
  • Carbon trim overlays – premium finish

✅ Paddle Shifters – Amazon
✅ MMI Box Retrofit – AliExpress

Interior mods are underrated — but for daily drivers, they’re some of the best first mods for Audi S5 B9.

H. DSG TCU Tune – Unlock Shifting Potential

The ZF8 is great stock — but a TCU tune makes it even better.

What it does:

  • Faster, harder shifts
  • Better downshift logic
  • Raised torque limits (for tuned setups)
  • Launch control settings

✅ IE TCU Tune
✅ [034 or APR TCU Tuning Also Available]

If you’re tuned or planning to be — don’t skip this.

I. Lightweight Wheels + Performance Tires – Looks and Grip

Wheels change everything. Lighter, wider, better-fitment options upgrade performance and aesthetics.

  • 19×9.5 or 20×10 fit great
  • Michelin PS4S or Firehawk Indy 500 tires = grip
  • Spacers optional depending on offset

✅ AVANT GARDE, Rotiform, etc. – Amazon
✅ AliExpress Flow Form Wheels

It’s one of the bigger expenses — but one of the most satisfying mods you’ll ever do.

J. Heat Management Mods – For Tuned Setups

If you’re running a Stage 2 tune or live somewhere hot, cooling becomes critical.

Top options:

  • Upgraded intercooler
  • Oil catch can
  • Turbo inlet pipe
  • Heat shielding

✅ 034 Intercooler – Amazon
✅ AliExpress Catch Can Systems

It’s not flashy, but it’s what keeps tuned S5s running strong and safe.

Final Thoughts – Building Your B9 S5 the Right Way

You don’t need to dump $20K into the car day one. Focus on the best first mods for Audi S5 B9 — the ones that change how it feels, sounds, drives, and looks right now.

Start with:

  • Intake
  • Tune
  • Exhaust
  • Springs
  • RS grille
  • Lighting upgrades

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