BMW M5 F90 downpipes are one of the biggest exhaust-side decisions on the S63 platform because they affect sound, turbo response, tuning plans, check-engine-light risk and street-use questions. Before ordering, confirm the exact fitment, whether you want catted or catless, how the car will be tuned, and whether the setup matches your use case in Quebec or Canada.
If you are comparing parts now, start with the AZM S63 BMW M5 F90 downpipes here: /products/azm-s63-bmw-downpipe-m5-f90. If you are planning a complete sound change rather than only a downpipe upgrade, also compare the F90 race exhaust system here: /products/azm-s63-bmw-exhaust-m5-f90.
Quick answer: what to know before buying F90 M5 downpipes
| Question | Short answer |
|---|---|
| Do F90 M5 downpipes require a tune? | Plan the purchase as a tune-sensitive modification. Many owners pair downpipes with a Stage 2-style calibration, but your exact tuning need depends on the downpipe type, ECU strategy, fuel, supporting mods and intended use. |
| Will they cause a CEL? | They can. Any change around the catalytic converters and oxygen-sensor monitoring can create check-engine-light risk. Do not assume any downpipe is a guaranteed no-CEL part. |
| Catted or catless? | Catted is usually the more controlled choice for smell and street manners. Catless is generally the more aggressive sound/flow choice, but with greater smell, noise, CEL and compliance questions. |
| Primary or secondary? | Confirm which section is being replaced before you order. Primary and secondary downpipes do different jobs in the exhaust path, and not every product or installer uses the same shorthand. |
| Install planning | Ask about hardware, gaskets, sensor handling, corrosion, heat shielding, post-install leak checks and tune scheduling before the car goes on the lift. |
| Fitment checks | Confirm F90 M5 fitment, model year, left-hand/right-hand details if relevant, exhaust compatibility and whether you are ordering only downpipes or pairing them with the cat-back/race exhaust. |
| Quebec/Canada caveat | Ask about noise, smell, inspection/emissions implications and intended use. AZM should not promise street legality or no-CEL outcomes for modified downpipe setups. |
Why F90 M5 downpipes are not a simple sound-only mod
A cat-back or race exhaust mostly changes the exhaust system after the downpipe area. Downpipes sit much closer to the turbo and catalyst monitoring, so they can change the way the car sounds, smells, responds and needs to be calibrated.
That is why shoppers searching for “f90 m5 downpipes install,” “f90 m5 downpipes and tune” or “bmw m5 f90 catted downpipes” are usually asking the right questions. The part itself matters, but the result depends on the whole plan: downpipe type, tuning support, install quality, use case and expectations.
For a broader BMW downpipe overview, see AZM’s BMW downpipe tune, CEL and fitment guide: /blogs/guides/bmw-downpipe-tune-check-engine-light-fitment-checklist.
If you are comparing F90 fitment with other S63 vehicles, use AZM’s S63 M5, X5M and X6M downpipe/exhaust fitment guide: /blogs/guides/bmw-s63-m5-x5m-x6m-downpipe-exhaust-fitment.
Buyer checklist before ordering BMW M5 F90 downpipes
Use this checklist before you place the order or book install time.
Confirm the car and platform
- BMW M5 F90, not the newer G90/G99 platform.
- Confirm model year and any vehicle-specific notes with AZM before ordering.
- If you are shopping for the new-generation M5 instead, compare the S68 G90/G99 downpipes separately: /products/azm-s68-bmw-downpipe-m5-g90-g99-2025-lci.
Confirm the exact product
- Ask whether the kit is for the F90 M5 S63 platform.
- Ask what is included: downpipes only, gaskets, clamps, hardware, sensor provisions or any optional items.
- Do not assume photos or fitment notes apply to every year without confirming.
Choose catted or catless intentionally
- Catted downpipes are usually chosen by drivers who want a more controlled setup.
- Catless downpipes are usually chosen by drivers prioritizing a more aggressive result.
- Neither choice should be treated as a guaranteed street-legal, no-smell or no-CEL solution.
Decide whether this is a downpipe-only project or a complete exhaust plan
- If the car already has an exhaust, confirm compatibility.
- If you want a larger sound change, compare the F90 race exhaust system: /products/azm-s63-bmw-exhaust-m5-f90.
- If you are still comparing platforms, browse the BMW M5 collection: /collections/bmw-m5.
Plan the tune before install day
- Ask whether your setup needs ECU calibration immediately after install.
- Ask whether the tuner wants any supporting mods completed first.
- Ask how CEL monitoring, readiness and drivability will be handled without expecting a guaranteed result.
Plan for a proper post-install check
- Leak check after heat cycling.
- Recheck clamps, fasteners and sensor routing.
- Listen for rattles or contact points.
- Review smell, noise and CEL status after the car has been driven.
Catted vs catless, primary vs secondary, downpipes vs exhaust
| Decision | What it means | Best fit when | Questions to ask AZM |
|---|---|---|---|
| Catted downpipes | Downpipes with catalytic converter material in the flow path. | You want a more controlled setup and care about smell, noise and daily drivability. | What catalyst option is available for this F90 product? What CEL risk remains? What tune strategy is recommended? |
| Catless downpipes | Downpipes without catalytic converters in that section. | The car is built for aggressive sound/response and the owner accepts more smell, noise, CEL and compliance questions. | Is this appropriate for my intended use? What tuning is required? What should I expect for odor and CEL risk? |
| Primary downpipes | The downpipe section closest to the turbo/catalyst monitoring area, depending on product terminology. | You want the main downpipe upgrade and understand it is tune/CEL-sensitive. | Does this product replace the primary section? What sensors and hardware are involved? |
| Secondary downpipes | A downstream section, depending on the exhaust layout and terminology. | You are trying to change a different part of the exhaust path or pair parts in stages. | Is the product primary, secondary or both? Will it connect to my current exhaust? |
| Downpipes | Turbo-side exhaust upgrade that can affect response, tone, smell, CEL and tuning. | You want a performance-oriented exhaust-side change and are ready to plan calibration. | Should I tune before or after install? What supporting mods should be done at the same time? |
| Cat-back / race exhaust | Exhaust system after the downpipe area. | You mainly want volume, tone and visual/tailpipe changes without changing the downpipe section. | Should I do the exhaust first, the downpipes first, or plan both together? |
The key point: “downpipes” and “exhaust” are not interchangeable terms. If you ask for “BMW M5 F90 downpipes” but really want more rear-section sound, the better first step may be the F90 exhaust system. If you want the turbo-side change, plan the downpipes and tune together.
For a deeper comparison of catted versus catless setups, smell, CEL and tune planning, read AZM’s catted vs catless downpipe checklist: /blogs/guides/catted-vs-catless-downpipe-sound-smell-cel-tune-quebec.
Install and tuning planning
A clean F90 M5 downpipe install is not only about bolting in the part. The planning should include access, sensor handling, heat management, corrosion, hardware condition and the tune schedule.
Before install, ask:
- Will the car be inspected for rusted or heat-cycled hardware before the work starts?
- Are replacement gaskets, clamps or one-time-use hardware recommended?
- How will oxygen sensors and wiring be protected during removal and reinstall?
- Will the shop check for leaks after the first heat cycle?
- Should the tune be completed the same day, before the first long drive, or after a short inspection drive?
- What symptoms should I watch for after install: exhaust leak sound, rattle, fuel smell, CEL, reduced power or unusual drivability?
For tune planning, use safe expectations. Downpipes can support a more aggressive calibration, but AZM should not promise a fixed horsepower number without the exact car, fuel, tune, dyno method and supporting mods. If your goal is a Stage 2-style setup, read the supporting-mods checklist here: /blogs/guides/stage-2-tune-requirements-supporting-mods-checklist.
Quebec, Brossard and Montreal considerations
For Quebec drivers, the smartest question is not only “will it fit?” It is “does this setup match how and where I use the car?”
If you are near Brossard, Montreal or the Rive-Sud, ask AZM:
- Is the car a street-driven daily, weekend car, show car, track car or off-road/race-use build?
- How loud will the setup be with my current exhaust?
- Should I expect more cold-start volume or exhaust smell?
- Will winter storage, road salt or hardware corrosion affect install time?
- Is a catted option more appropriate for my expectations?
- What should I understand about inspection, emissions, noise and street-use risk before choosing the part?
- If I already have a cat-back exhaust, will downpipes make the car too loud for my use case?
This is where a local shop has an advantage over a generic online parts listing. A proper recommendation should match the part to your exact F90 M5, your tune plan, your tolerance for sound and smell, and your intended use in Quebec or Canada.
Recommended order: downpipes first or exhaust first?
There is no single correct order for every F90 M5. Use the goal to decide.
| Goal | Better first move |
|---|---|
| More sound and character without immediately planning a tune-sensitive turbo-side change | Start by comparing the F90 race exhaust system. |
| Stage 2-style performance plan with tune, supporting mods and more aggressive response | Plan downpipes and tuning together. |
| Unsure whether the car will be too loud | Talk through downpipes plus exhaust as a complete system before buying either part. |
| Already has an aftermarket exhaust | Confirm downpipe compatibility, noise level and tune/CEL plan before ordering. |
If you want to browse related BMW parts, start with /collections/bmw-downpipes, /collections/bmw-m5 or the broader /collections/bmw collection.
Final pre-order checklist
Before ordering BMW M5 F90 downpipes, confirm these points in writing:
- Exact vehicle: BMW M5 F90, model year and S63 platform.
- Exact part: AZM S63 BMW M5 F90 downpipes.
- Catted or catless choice.
- Primary/secondary section being replaced.
- Compatibility with the existing exhaust or planned race exhaust.
- Hardware, gaskets and sensor provisions.
- Tune plan and timing.
- CEL risk and how it will be handled.
- Sound and smell expectations.
- Intended use and Quebec/Canada compliance questions.
- Install quote variables: labour time, condition of hardware, extra parts, tuning appointment and post-install inspection.
FAQ
Do BMW M5 F90 downpipes require a tune?
Plan as if they are tune-sensitive. Some downpipe setups may physically install without an immediate calibration, but the better buying decision is to discuss the tune before install. A Stage 2-style plan usually considers downpipes, fuel, supporting mods, CEL strategy and drivability together.
Will F90 M5 downpipes cause a check engine light?
They can. Because downpipes affect the area around catalyst and oxygen-sensor monitoring, a CEL is a real risk, especially with more aggressive configurations. Do not buy any F90 M5 downpipe expecting a guaranteed no-CEL outcome unless AZM has confirmed the exact setup and limitations.
What is the difference between primary and secondary downpipes on an F90 M5?
Primary and secondary refer to different sections in the downpipe/exhaust path. The important step is to confirm exactly which section the product replaces, what sensors or hardware are involved, and how it connects to the rest of your exhaust. Do not rely on shorthand alone.
Are catted or catless downpipes better for an F90 M5?
Neither is automatically “better.” Catted is usually the more controlled choice for smell, tone and daily manners. Catless is usually more aggressive, but it can bring more odor, noise, CEL and compliance concerns. Match the choice to your intended use and tuning plan.
How much does F90 M5 downpipe installation usually cost?
The final install cost depends on labour rate, hardware condition, corrosion, access, whether extra gaskets or clamps are needed, whether the car already has exhaust modifications, and whether tuning is booked at the same time. Ask AZM for a quote based on your exact F90 M5 rather than relying on a generic online number.
What should I confirm before ordering BMW M5 F90 downpipes?
Confirm F90/S63 fitment, model year, catted or catless configuration, primary/secondary section, included hardware, exhaust compatibility, tune requirements, CEL risk, sound/smell expectations and intended use. If the car is in Quebec, also ask about noise, inspection and street-use considerations before buying.
Do downpipes change sound, smell and turbo response on the F90 M5?
Yes, downpipes can change the car’s sound character, smell and response because they sit close to the turbo side of the exhaust system. The size of the change depends on the downpipe configuration, whether the car has a stock or aftermarket exhaust, and how it is tuned.
Should I install downpipes before or after an exhaust on an F90 M5?
If your main goal is tone and volume, compare the exhaust first. If your goal is a tune-supported performance setup, plan the downpipes and calibration together. If you eventually want both, talk through the complete system so the final car is not louder or more aggressive than you want.
What should Quebec/Montreal drivers ask before installing F90 M5 downpipes?
Ask about winter hardware condition, road-salt corrosion, sound level, cold-start volume, smell, tune timing, CEL risk and intended use. For Montreal, Brossard and Rive-Sud drivers, it is also worth asking whether a catted setup better matches how the car will actually be driven.
Are F90 M5 downpipes legal for street use in Quebec or Canada?
Do not assume modified downpipes are automatically legal for street use. Legality can depend on emissions equipment, noise, inspection rules, intended use and local enforcement. Ask AZM to explain the street-use and off-road/race-use implications for the exact configuration before ordering.
Next step
If you are ready to compare parts, start with the AZM S63 BMW M5 F90 downpipes: /products/azm-s63-bmw-downpipe-m5-f90. If you want the larger sound package, compare the F90 race exhaust system as well: /products/azm-s63-bmw-exhaust-m5-f90.
