Best Intercooler Upgrades for Audi S5 B9 (2017–2023)
If you’re running a tuned Audi S5 B9 — especially Stage 1 or Stage 2 — your stock intercooler is straight up…
If you’re running a tuned Audi S5 B9 — especially Stage 1 or Stage 2 — your stock intercooler is straight up holding you back. The factory unit works fine for stock boost levels, but once you’re tuned, intake temps skyrocket. That means timing gets pulled, power fades, and everything feels soft after a few hard pulls.
In this guide, we’re diving into the best intercooler upgrade for Audi S5 B9, why it’s critical for performance and reliability, and the top kits worth your money. We’re talking real IAT drops, daily-driver friendly installs, and which brand delivers the best bang for your boost.
🧊 Why the Stock Intercooler Just Isn’t Enough
Audi didn’t build the B9 S5 to live at 20+ PSI of sustained boost. The stock front-mount intercooler (FMIC) is a compromise between cost, emissions, and packaging. That’s fine at stock levels — but once you’re tuned? It’s a choke point.
Here’s what happens when you push the stock FMIC too hard:
- IATs spike above 130°F after 1-2 pulls
- ECU pulls timing to protect the engine
- Power gets soft up top — especially in hot weather
- Repeated pulls feel inconsistent
The solution: a high-performance front mount intercooler (FMIC) with more volume, better fin density, and lower pressure drop.
🔥 What You Gain from an Intercooler Upgrade
Let’s break down the benefits of installing the best intercooler upgrade for Audi S5 B9:
✅ Lower Intake Air Temps (IATs)
Expect 25–40°F drops in peak temps after a few hard pulls, depending on ambient conditions. That means no more heat soak.
✅ Consistent Power
No more 1-pull wonder. You get repeatable performance whether you’re canyon carving or doing highway pulls back-to-back.
✅ Better Tuning Headroom
Colder, denser air = less knock = more aggressive ignition timing = more power.
✅ Long-Term Reliability
Keeping IATs under control helps preserve your turbo, plugs, coils, and engine internals.
✅ Turbo Sounds & Spool
Some intercoolers can slightly change the whistle or whoosh of your turbo under load — depends on design and piping.
🧰 What to Look for in an Intercooler Upgrade
All intercoolers are not built equal. Look for these features when hunting down the best intercooler for your Audi S5 B9:
| Feature | Why It Matters |
|---|---|
| High Core Volume | More surface area = better cooling |
| Bar-and-Plate Construction | Stronger, more efficient heat transfer |
| End Tank Design | Smooth flow = less pressure drop |
| Bolt-On Fitment | No cutting or fab needed |
| Proven IAT Data | Real-world temp drops backed by testing |
| Optional Charge Pipes | Some kits include or upgrade piping too |
Now let’s talk about the best options out there.
🥇 1. Wagner Tuning Competition Intercooler EVO 1
🔗 Buy on Amazon
🔗 Internal Guide
Why it’s great:
Wagner Tuning has been killing it for years — especially for VAG cars. Their B9 S5 EVO 1 intercooler offers a +117% core volume increase over stock, and drops IATs by 25–35°F under repeated pulls.
Specs:
- Bar-and-plate core
- Cast aluminum end tanks
- Plug-and-play install
- No cutting, trimming, or modifications needed
Pros:
✔ Huge core size
✔ No CELs or weird fitment issues
✔ Proven dyno and IAT results
✔ Retains stock crash bar and sensors
Cons:
✖ Higher price tag (around $1,200–$1,400)
✖ No upgraded charge pipes included
Verdict:
This is the best intercooler upgrade for Audi S5 B9 if you want performance and OEM+ install quality. Built for both street and track abuse.
🥈 2. CTS Turbo Front Mount Intercooler Kit
🔗 Buy on CTSTurbo.com
🔗 AliExpress Alternative
Why it’s great:
CTS Turbo delivers a strong-performing intercooler at a mid-range price. It’s slightly smaller than the Wagner, but still gives big IAT drops and solid throttle response.
Specs:
- T6061 aluminum
- Precision TIG-welded
- Bolt-on install
- Retains stock sensors and mounting
Pros:
✔ Great bang for buck (~$800–$1,000)
✔ Bolt-on fitment
✔ Noticeable performance bump over stock
✔ Good choice for Stage 1 or light Stage 2 builds
Cons:
✖ Slight trimming on some models
✖ Less name recognition than Wagner or APR
Verdict:
For a solid daily driver or weekend pull car, CTS gets the job done at a more approachable price.
🛠️ Installation: DIY or Shop?
Installing the best intercooler upgrade for Audi S5 B9 isn’t the hardest mod, but it’s not plug-and-play like a tune or intake either. Here’s what to expect:
DIY Difficulty: 6/10
- Remove front bumper (torx bits + clips)
- Drain coolant if routing through front crash bar
- Loosen and swap clamps + charge piping
- Mount intercooler, reattach hoses
- Reinstall bumper, check fitment
Tools Needed:
- Ratchet set
- Torque wrench
- Trim removal tools
- Jack + stands or lift
- Possibly: Dremel (if trimming needed)
If you’ve done your intake or downpipe, this is doable. Otherwise, budget 2–3 hours at a shop (around $200–$300 in labor).
🥉 3. ARM Motorsports Front Mount Intercooler
🔗 Buy from ARM Motorsports
🔗 Amazon Listing
Why it’s worth your time:
This is your budget warrior with real engineering. ARM Motorsports brings a bar-and-plate design, CNC-machined inlets/outlets, and a 100% bolt-on fit — all for under $800.
Specs:
- 640 cubic inch core
- Direct-fit, stock mounting locations
- Maintains factory crash bar clearance
- TIG-welded aluminum
Pros:
✔ Very competitive price
✔ Legit airflow improvement
✔ Perfect for tuned daily drivers
✔ Comes with new hardware
Cons:
✖ No charge pipes included
✖ Not the biggest core volume
Verdict:
If you’re tuned and want a reliable upgrade without stretching the budget, ARM’s intercooler is a sleeper win.
💸 4. AliExpress Intercoolers – Do They Hold Up?
🔗 AliExpress Intercooler Search
Let’s not lie — a ton of Audi guys are testing these and posting results. They’re clones of name-brand intercoolers at 1/3 the price. Think $200–$350 shipped.
What to know:
- You’ll likely get bar-and-plate
- Cast end tanks aren’t always precision-matched
- Fitment may require finesse (grinding, trimming)
- No warranty, no brand support
Pros:
✔ Stupid cheap
✔ Real temp drops when it fits
✔ Can be good backup or test unit
Cons:
✖ QC roulette — welds can be sketch
✖ No proven testing or dyno support
✖ You’re on your own if something doesn’t line up
Verdict:
If you’ve got time, tools, and patience — these can surprise you. But don’t expect Wagner performance at Wish prices.
📊 Real-World Results: Power, Temps & Tuning Gains
🔥 Wagner vs Stock – Dyno Data
- Stock IAT after 3 pulls: ~137°F
- Wagner EVO IAT: ~97°F
- Peak WHP gain: ~12–18whp on tuned S5 B9
- Throttle response: Sharper, smoother across gears
💨 CTS vs Stock
- IAT drop: ~20°F
- More stable boost pressure at redline
- Noticeable improvement on hot days and road course use
🧪 AliExpress FMIC (random test)
- IAT drop: 10–15°F
- Power felt consistent for 1–2 pulls, then faded
- Fitment: Required small Dremel work on crash bar
🔧 Mods That Pair Perfectly With an Intercooler Upgrade
If you’re already popping the bumper off and getting under there, don’t waste the opportunity. Pair these with your intercooler install:
| Mod | Why It Pairs Well |
|---|---|
| Charge Pipes | Many stock pipes are plastic — upgrade to aluminum or silicone to prevent flex and leaks |
| Turbo Inlet Pipe | Improves pre-turbo flow and sharpens throttle feel |
| Cold Air Intake | Completes the airflow path — lets the new FMIC breathe even better |
| ECU/TCU Tune | You’ll unlock the real gains after the ECU sees lower IATs |
🔗 Best Turbo Inlet Pipe for Audi S5 B9 →
🔗 Best Intake for Audi S5 B9 →
❌ Avoid These Common Mistakes
Before you order or install your intercooler, here’s what not to do:
A. Don’t Ignore Fitment
Each brand fits a little differently. Double-check the product specs and make sure it’s built for the B9 S5, not just the A4/A5 2.0T platform.
B. Don’t Cheap Out on Clamps
If you re-use old worm clamps or try to tighten them too much, you’ll get boost leaks. Spring clamps or high-quality T-bolts are best.
C. Don’t Expect Turbo-Like Gains
An intercooler supports power — it doesn’t make it. It’s what keeps you fast all the time, not just once.
D. Don’t Forget to Re-Align the Bumper
If it’s off by even a few millimeters, it’ll look janky. Take your time lining up clips and sensors.
🏆 Final Ranking – Best Intercooler for Audi S5 B9
| # | Intercooler | Best For | Price |
|---|---|---|---|
| 🥇 1 | Wagner EVO 1 | All-out performance & reliability | ~$1,200+ |
| 🥈 2 | CTS Turbo | Balanced daily + pull car | ~$850 |
| 🥉 3 | ARM Motorsports | Budget Stage 1/2 builds | ~$780 |
| 🛠️ 4 | AliExpress FMIC | Budget builders with tools | ~$250 |
🔗 Where to Buy
| Retailer | Link |
|---|---|
| Amazon | Search Audi S5 B9 Intercooler |
| AliExpress | Budget Intercoolers |
| Wagner | wagner-tuning.com |
| CTS Turbo | ctsturbo.com |
| GermanCarMods | Our Blog Hub |
🧠 Final Thoughts
The best intercooler upgrade for Audi S5 B9 is the one that keeps your IATs low and fits your build goals. Whether you’re chasing every horsepower or just want your Stage 1 tune to feel strong even on hot days, this mod is worth every penny.
If you’re planning to go Stage 2, hybrid turbo, or just want maximum consistency from your daily driver — this is the move.