When you’re serious about extracting every ounce of performance from your BMW, there’s one upgrade that often tops the list for enthusiasts and tuners alike—aftermarket downpipes. Whether you’re looking to unleash the growl of your M engine, boost turbo spool times, or simply improve exhaust flow for more power, downpipes can make a significant difference. In this article, we’ll explore two exciting and current offerings in the performance tuning world: the bmw m5 g90 g99 secondary downpipes and BMW M3 G80 downpipes.
Why Downpipes Matter in Performance Upgrades
At the heart of any turbocharged engine lies a simple truth: the easier it is to expel exhaust gases, the faster the turbo can spool and generate power. That’s where downpipes come in. They replace the restrictive factory piping between the turbocharger and the rest of the exhaust system. In the case of performance BMWs, especially M models, even the secondary downpipes can limit the true potential of the engine.
By upgrading to high-flow downpipes—whether primary or secondary—you improve throttle response, reduce turbo lag, and often gain substantial horsepower and torque, especially when combined with a tune. The result is a more responsive, aggressive, and dynamic driving experience.
BMW M5 G90/G99 Secondary Downpipes: A Sleeper’s Weapon
The G90 and G99 variants of the BMW M5, both powered by BMW’s 4.4-liter twin-turbo V8, are nothing short of monsters on the street. But even with all their factory power, the exhaust flow is choked slightly by the OEM setup. That’s where aftermarket secondary downpipes come in.
Secondary downpipes are located after the primary catalytic converters, which means that upgrading them doesn’t directly affect emissions compliance in many regions. This makes them an attractive option for enthusiasts who want more sound and flow without removing factory emissions equipment.
Upgrading the BMW M5 G90 G99 secondary downpipes typically results in:
- A deeper, throatier exhaust note without drone
- Noticeably better mid-range and top-end performance
- Improved airflow that supports higher tuning levels
- Lightweight construction with materials like stainless steel or titanium
Installation is often straightforward, and when paired with a Stage 1 or Stage 2 ECU tune, these downpipes can unlock hidden horsepower waiting to be released.
BMW M3 G80 Downpipes: Refining the S58 Powerplant
The G80 generation of the BMW M3 introduced the potent S58 engine—a 3.0-liter twin-turbocharged inline-six that already boasts impressive figures from the factory. But true to BMW M fashion, there’s still room for improvement.
One of the most impactful modifications for this platform is the installation of aftermarket downpipes. Whether you go for high-flow catted or catless variants, the benefits are undeniable.
With a proper ECU tune, bmw m3 g80 downpipes offer:
- Faster turbo spool and reduced lag
- Gains of 30–60+ horsepower depending on supporting mods
- Sharper throttle response and a more aggressive exhaust tone
- A race-ready look and feel without sacrificing daily drivability
High-quality downpipes are often constructed from T304 stainless steel and TIG-welded for durability. Brands like Active Autowerke, Eventuri, and ARM Motorsports have all developed trusted options that cater to both street and track builds.
Important Considerations Before Upgrading
While the benefits of downpipes are clear, here are a few things to keep in mind:
- Tuning is essential: To fully reap the rewards, a matching ECU tune is required.
- Check your local laws: Some jurisdictions have strict emissions laws—always ensure you’re compliant.
- Warranty concerns: Modifying exhaust components may impact your factory warranty, so do your research.
Final Thoughts
For BMW M enthusiasts, few upgrades deliver the bang-for-buck that downpipes do. Whether you’re behind the wheel of a ferocious M5 G90 or the nimble G80 M3, upgrading your downpipes is a powerful way to transform your driving experience.