Why Upgrade the S62 Intake System?

The S62 V8, found in the E39 M5 and early Z8, is already a masterpiece of engineering—delivering 394 horsepower from the factory. However, its intake system was designed with a balance of noise regulations, packaging constraints, and cost. While the factory system is efficient, it leaves measurable power on the table. Upgrading the intake system allows the engine to breathe more freely, reducing restriction and allowing the engine to produce more power with the same displacement and cam timing.

The primary benefits of an intake upgrade on the S62 include:

  • Increased airflow volume – A less restrictive intake path lets the engine draw in more air per cycle, which, when combined with proper fueling, directly increases torque and horsepower.
  • Improved throttle response – Lightweight intake components (especially carbon fiber) reduce intake path inertia, making the engine feel more responsive to throttle inputs.
  • Enhanced intake sound – The S62’s intake roar is legendary; aftermarket intakes amplify the induction note without the raw drone of an aftermarket exhaust.
  • Potential for higher peak power – With complementary mods (tune, exhaust, headers), a high-flow intake can unlock 20–40 whp gains.
  • Better thermal management – Cold air intakes shield the filter from engine heat, lowering intake air temperatures (IATs) for denser air charge.

Understanding the S62 Stock Intake Design

Before selecting an upgrade, it helps to understand what the factory system does—and where it falls short. The stock S62 intake consists of two separate airboxes (one per bank) with paper filters, a mass airflow (MAF) sensor housing, and a complex resonator/intake silencer system designed to mute induction noise. Each airbox draws air via a duct that pulls from the front grille area, which is a decent cold-air source, but the internal geometry includes several baffles and a large plenum chamber that restrict flow at high RPM.

Restriction points

  • Paper filter media – Standard paper filters have a good balance of filtration and flow for a daily driver, but aftermarket oiled cotton or synthetic filters flow significantly more air with equivalent filtration.
  • Resonator chambers and silencers – The factory airboxes include helmholtz resonators that cancel specific frequencies at the cost of airflow volume and turbulence.
  • Intake tract diameter and smoothness – The stock tubing has several sharp bends and transitions that create turbulence and air separation, reducing volumetric efficiency.

By upgrading to a system with larger diameter, smoother mandrel-bent tubing, and a high-flow filter, you reduce pressure drop before the throttle plate. This gives the engine more air at a given throttle opening—the fundamental goal of any intake upgrade.

Types of Intake Upgrades for the S62

Cold Air Intakes (CAI)

A true cold air intake relocates the air filter outside the engine bay, usually behind the bumper or into the fender, to draw ambient air rather than underhood hot air. On the S62, this often requires a kit that replaces the entire intake snorkel and filter box. The benefit is lower IATs, which can yield 5–10 hp more than a same-day hot-air intake, especially during summer driving or repeated pulls. However, installation can be invasive, and some kits require cutting of plastic trim or relocating washer fluid reservoirs.

Short Ram Intakes

Short ram intakes replace the factory airbox with a filter attached directly to the MAF housing or throttle body snout. They are simpler and cheaper to install but tend to pull hot engine bay air, especially in stop-and-go traffic. While they still offer flow gains over the stock airbox, their power advantage is sometimes offset by heat soak. Many short ram kits for the S62 include a heat shield to mitigate this.

Open vs. Closed-Box Designs

Some aftermarket intakes (e.g., Eventuri, Dinan) use a closed carbon fiber box that seals the filter from engine heat while maintaining a direct cold-air duct to the front grille. These are arguably the best all-around design: they keep IATs low without the complexity of a full CAI relocation. Open-element designs (e.g., K&N Typhoon) are less effective at isolating heat but offer a more aggressive sound and easier filter access.

Material Choices: Carbon Fiber vs. Aluminum vs. Plastic

Intake tubes are commonly made from aluminum (heat conductive), plastic (heat-insulative but less durable), or carbon fiber (lightweight, heat-shedding, and visually appealing). For the S62, carbon fiber intakes like the Eventuri or GruppeM are popular not only for their thermal properties but also for their distinctive weave appearance under the hood. Aluminum intakes (e.g., Injen) often come with a polished or black powder coat finish and are more affordable, but they can transmit engine bay heat to the incoming air if not wrapped or shielded.

Top Brands for S62 Intake Upgrades

Eventuri

Eventuri’s S62 intake is an award-winning closed carbon fiber system that replaces both airboxes with a single plenum and filter assembly. Their patented Venturi stack design creates a pressure differential that forces air through a large cotton filter mounted inside a ducted box. Independent dyno tests show gains of 15–20 whp on otherwise stock S62 engines, and more when paired with a tune. The build quality is exceptional, but the price reflects that—the Eventuri S62 intake typically costs $1,200–$1,500 USD. Check current pricing at Eventuri.

Dinan

Dinan has long offered a carbon fiber cold air intake for the E39 M5. Their design uses a large carbon fiber box that seals against the hood and draws air from the factory grille duct. Gains are modest but consistent: around 10–12 whp with no tuning required. Dinan intakes are CARB-legal (50-state street legal) and include a washable filter. Price is generally $700–$900. Dinan also offers a corresponding throttle body upgrade that further improves airflow.

K&N

K&N’s S62 intake is a simpler short ram system with a conical oiled cotton filter and a heat shield. It is priced competitively at $350–$450 and provides gains of approximately 8–12 whp on a dyno. The primary benefit here is the lifetime filter (washable) and the aggressive intake sound. However, because it does not fully seal the filter from engine heat, IATs can rise in traffic. It remains a solid budget-friendly option for enthusiasts who want flow and induction noise without spending thousands.

Injen Technology

Injen’s “SP” series intake for the S62 uses mandrel-bent aluminum tubing, a washable synthetic filter, and a powder-coated heat shield. Gains are dyno-proven at 10–15 whp on the S62. Injen is known for their “MR” (MR Fluid) process that creates a smooth internal finish for reduced turbulence. Price is around $400–$500.

GruppeM

GruppeM, a Japanese firm, produces a high-end carbon fiber ram intake for the S62 that is widely considered one of the most effective designs. Their system uses an oversized carbon fiber snorkel that forces air into a sealed chamber. Gains can reach 20–25 whp on a tuned car. However, availability is limited and the price often exceeds $1,600. Visit GruppeM’s official site for latest offerings.

AFE Power

AFE Power offers an “Momentum GT” intake that uses a dry synthetic media filter (no oil) and a sealed housing with a clear lid. Gains are around 10–12 hp. It is emissions-legal and priced at $500–$600.

Cost Analysis and Expected Power Gains

The table below summarizes typical price brackets and the horsepower gains you can realistically expect on a stock S62 (before tuning). Gains from a standalone intake without a tune are almost always under 20 whp; the true nature of an intake is to enable larger gains when combined with other mods.

  • Budget tier ($350–$600): K&N, Injen, AFE Power – 8–15 whp. Good for improved sound and response, modest power.
  • Mid-range ($700–$1,000): Dinan, some custom setups – 10–15 whp. Better heat management, often more refined fitment.
  • High-end ($1,200–$1,800): Eventuri, GruppeM – 15–25 whp. Carbon fiber construction, optimized aerodynamics, and substantial torque gains across the curve.

It is important to note that peak power numbers vary by dyno, temperature, and fuel quality. A 15 whp gain on a chassis dyno typically equates to about 18–20 hp at the crank.

Installation and Tuning Considerations

While many aftermarket intake kits come with detailed instructions, the S62’s engine bay is tight. Removing the factory airboxes requires disconnecting the MAF sensors, breather hoses, and several electrical connectors. The carbon fiber systems often require precise alignment to avoid rubbing on hood insulation or engine components. Expect 2–4 hours of labor at a shop, priced at $100–$200.

MAF sensor calibration

Some intakes change the diameter of the intake tube immediately before or after the MAF sensor housing. This can alter the airflow signal to the ECU, potentially causing lean or rich conditions. High-end systems like Eventuri include a MAF housing that matches the factory diameter to avoid this. If you install a short ram system with a silicone coupler that changes the pipe size, you may need an ECU tune to recalibrate the MAF scaling.

ECU tuning for maximum gains

To realize the full potential of an upgraded intake, a custom tune (or a flex fuel tune) is highly recommended. The stock ECU will adapt to slightly more airflow via fuel trims, but it cannot fully exploit the larger volume without ignition timing adjustment and fuel mapping. Many S62 owners pair an intake with a performance tune from RK Tunes, Dinan, or Evolve. Gains from the combination can reach 40–50 whp over stock.

Throttle body upgrade compatibility

Upgrading the intake alone without addressing the throttle bodies is a common oversight. The S62 uses two electronically controlled throttle bodies (one per bank). Some owners upgrade the throttle bodies to larger 82mm or 85mm units (e.g., from DBW or Maximilian) to match the improved airflow. This further increases top-end power by reducing restriction at the intake manifold entry.

Real-World Performance Results

Independent testing by owners on forums such as M5Board and M5Forum has yielded consistent results. One member reported a 16 whp gain from a Dinan intake alone on a dyno Dynamics machine, with a noticeable improvement in part-throttle response. Another user with an Eventuri intake and a tune measured 442 whp on a Mustang dyno—an increase of over 40 whp from the stock baseline of 395 whp (engine power derived).

A well-documented build by a performance shop called “EK Performance” showed that with an intake, catless headers, a 3.5-inch exhaust, and a custom tune, an S62 can surpass 500 whp—a figure that would require significant forced induction in most engines. The intake contributed roughly 18 of those wheel horsepower.

These numbers underscore that the intake is not a magical upgrade but an enabler. By itself it yields modest gains; as part of a comprehensive package, it is essential.

Choosing the Right Intake for Your S62 Goals

Street-driven daily driver

If your S62-powered car (E39 M5, Z8) is a weekend toy or daily driver, you likely prioritize sound, reliability, and a clean factory fit. In this case, a closed-box cold air intake like Dinan or Eventuri is ideal. They maintain low IATs, do not require ongoing re-tuning, and keep the engine bay looking OEM+. Budget: $700–$1,500.

Track or performance-oriented

If you take your car to the track or autocross frequently, choose an intake that maximizes flow and minimizes heat retention. A carbon fiber system with a dedicated cold-air feed (e.g., GruppeM or Eventuri) will offer the best sustained power. Combine with a tune and throttle body upgrade for best results. Budget: $1,200–$2,000 plus tuning.

Budget-conscious upgrade

For those on a tighter budget, a K&N or Injen short ram intake with a heat shield provides a noticeable improvement in sound and a small power bump. Adding a separate cold-air duct (e.g., a mesh panel behind the grille) can mitigate hot air issues. Budget: $350–$500.

Maintenance of the Upgraded Intake

Aftermarket filters require periodic cleaning. Oiled cotton filters (K&N, Injen) need re-oiling every 30,000 miles or after heavy dust exposure; avoid over-oiling to prevent MAF contamination. Dry synthetic filters (AFE, Eventuri) can be cleaned with water and air-dried. Inspect silicone couplers for cracks and ensure all clamps are tight. Carbon fiber housings should be wiped clean with a microfiber cloth; avoid abrasive cleaners that can scratch the clear coat.

Conclusion

Upgrading the S62 intake system is one of the most rewarding modifications you can make to your M5 or Z8. It delivers a visceral driving experience through enhanced sound and throttle response, and forms the foundation for future power mods. With brands ranging from accessible (K&N, Injen) to exotic (Eventuri, GruppeM), there is an option for every budget and goal. Pair your intake with a proper tune and complementary exhaust work, and you will unlock the full potential of BMW’s legendary V8. Join the M5Board community to see real owner reviews, and consult a trusted shop before purchase to ensure compatibility with your specific vehicle year and emissions requirements.