The G87 BMW M2 arrives as a seriously capable sports coupe, packing the S58 engine that also powers the M3 and M4. While the stock turbocharger setup delivers impressive performance from the factory, many owners quickly discover that the real potential of this platform is unlocked with a turbocharger upgrade. Whether you are chasing higher horsepower for track days, drag racing, or simply want a more exhilarating daily driver, understanding the costs, benefits, and realistic power gains is essential. This guide provides a thorough breakdown of G87 M2 turbocharger upgrades, covering everything from kit selection and supporting modifications to tuning strategies and budget planning.

How Turbocharger Upgrades Work on the G87 M2

The S58 engine uses twin mono-scroll turbochargers — one per bank of three cylinders. Each turbo is relatively small from the factory, which keeps spool quick and throttle response sharp. However, these small turbos run out of steam at higher RPMs and at elevated boost levels. Upgrading the turbochargers allows the engine to ingest more air and hold that airflow higher in the rev range, directly translating to significant horsepower and torque gains.

Turbo upgrades generally fall into three categories, each with its own cost, complexity, and power ceiling:

  • Stock replacement / upgraded core turbos – Use the original turbo housings but with larger compressor and turbine wheels, improved bearings, and sometimes revised compressor covers. They are a direct bolt-on and offer a moderate power increase with minimal supporting modifications.
  • Hybrid turbos – Combine the factory manifold and exhaust housing with larger internals and a custom center section. Hybrids typically require some modifications (e.g., intake piping or diverter valves) and deliver more airflow than stock replacement units.
  • Full aftermarket turbocharger systems – Completely replace the entire turbo assembly with larger, purpose-built units. These kits often require extensive supporting modifications, including upgraded intercoolers, fuel systems, and custom tuning. They offer the highest power potential but also the highest cost and complexity.

Stock Replacement Upgraded Turbos

These are the most straightforward upgrade path. Companies like Pure Turbos, Vargas Turbo, and Dinan offer “stage 1” or “600 HP” turbochargers that fit into the factory location. The compressor wheel and turbine are enlarged while keeping the stock manifold and downpipe connections. Gains are typically in the 10–20% range over stock, depending on tuning. This is an excellent option for owners who want a reliable increase without replacing a dozen other parts.

Hybrid Turbo Kits

Hybrid setups push further by using a larger compressor housing and sometimes a bigger turbine wheel, but still fitting the factory exhaust manifold. They provide a broader power band with higher peak flow. Some hybrid kits require upgrading the charge pipes or intercooler. Gains can reach 20–40% over stock, and many tuners target 650–700 wheel horsepower with these turbos on pump gas.

Full Aftermarket Turbo Systems

For those aiming at 800+ wheel horsepower, full aftermarket turbo systems from brands like Precision Turbo, Garrett, or Pure Turbos (stage 2+ or stage 3) are the answer. These systems typically include larger compressor and turbine housings, billet wheels, and sometimes ball-bearing center cartridges for faster spool. Installation is more involved, often requiring removal of the engine or subframe, and the cost can be substantial. Supporting modifications are mandatory: upgraded intercoolers, larger downpipes, a high-flow exhaust, fuel system upgrades (injectors, high-pressure fuel pump, and sometimes port injection), and a robust custom tune.

Cost Breakdown: Turbocharger Upgrades and Supporting Mods

Pricing varies by brand, quality, and what is included in the kit. Here is a realistic breakdown of costs for a G87 M2 turbo upgrade, not including labor:

  • Upgraded stock replacement turbos (pair): $2,500 – $4,500
  • Hybrid turbo kit (pair): $3,500 – $6,000
  • Full aftermarket turbo system (pair): $5,000 – $9,000+
  • Turbo installation labor: $1,500 – $3,500 (depending on whether extra modifications are needed)
  • Custom ECU tuning (dyno or remote): $500 – $1,500
  • Upgraded intercooler: $500 – $1,200
  • High-flow downpipes: $600 – $1,200
  • Cold air intake system: $300 – $800
  • Fuel system upgrades (if needed): $1,000 – $4,000 (injectors, HPFP, port injection kit)
  • Oil cooler upgrade (recommended for sustained high boost): $400 – $1,000
  • Miscellaneous gaskets, fluids, hardware: $200 – $600

A total budget for a comprehensive turbo upgrade with supporting modifications can range from $6,000 to over $15,000, not counting the cost of the vehicle or typical maintenance items. The higher end includes full aftermarket systems with fuel system upgrades and professional dyno tuning.

Realistic Power Gains: What to Expect

Horsepower numbers depend heavily on fuel quality, tuning, and the specific turbo setup. The following ranges are based on known results from G87 M2 owners and tuners:

  • Stock replacement upgraded turbos (e.g., Pure Stage 1): 600–650 wheel horsepower (whp) on 93 octane; 650–700 whp on E85
  • Hybrid turbos (e.g., Vargas, Dinan): 650–750 whp on 93 octane; 700–800 whp on E85
  • Full aftermarket turbos (e.g., Pure Stage 2+ / Stage 3): 750–900+ whp with race fuel or E85, supported by fuel system upgrades and port injection

Torque typically peaks between 600–750 lb-ft, often limited by the transmission’s torque rating or the drivetrain’s ability to put the power down. It is important to note that doubling horsepower from stock (around 450 whp) to over 800 whp requires not only turbos but also comprehensive supporting modifications and very careful tuning to avoid engine damage.

Supporting Modifications: Why You Can’t Just Bolt On Turbos

Intercooler and Charge Air Cooling

Increased boost generates more heat. The factory intercooler on the G87 M2 works well at stock power levels, but once you push above 550–600 whp, intake air temperatures (IATs) rise rapidly, causing timing pull and power loss. An upgraded intercooler with a larger core and better end tanks is mandatory for any turbo upgrade beyond mild stock replacement turbos.

Downpipes and Exhaust

Restrictive factory downpipes limit exhaust flow, choking turbo spool and peak power. Replacing the downpipes with high-flow catless or catted versions reduces backpressure and lowers exhaust gas temperatures (EGTs). Most turbo upgrade kits require aftermarket downpipes to achieve their stated power figures. A full cat-back exhaust further reduces restriction and adds weight savings, though it is not strictly necessary for power.

Fuel System Upgrades

The S58’s direct injection system can supply enough fuel for roughly 650–700 whp on E85. Beyond that, the high-pressure fuel pump (HPFP) and injectors reach their limit. Solutions include upgraded HPFPs, larger injectors, and often a port injection system that introduces additional fuel into the intake manifold. Port injection also helps clean the intake valves, a known maintenance benefit.

Engine Tuning (ECU Flash)

Upgraded turbos require a custom ECU tune to adjust boost targets, fuel delivery, ignition timing, and vanos control. Off-the-shelf tunes exist for common turbo kits, but a custom dyno tune is strongly recommended for optimal performance, drivability, and safety. Tuning platforms like Bootmod3, ECUtek, and MHD are popular among G87 M2 enthusiasts. A skilled tuner can also set up boost-by-gear and torque management to protect the drivetrain.

Reliability Considerations and Longevity

Upgraded turbos push the S58 closer to its mechanical limits. While the engine block and internals are robust from the factory, sustained operation at 700+ whp increases stress on the bearings, piston rings, and valvetrain. Proper cooling and oiling become critical. An upgraded oil cooler, higher-oil-capacity pan, and possibly a larger radiator help manage thermal loads during track sessions or repeated pulls.

Another factor is turbocharger lifespan. Ball-bearing turbos spool faster and can last longer than journal-bearing units, but they are more expensive. Most aftermarket turbos come with a limited warranty (usually 12–24 months). Regular oil changes with high-quality synthetic oil and short intervals (3,000–5,000 miles) help prolong turbo life.

Warranty and emissions considerations also matter. Modifications that remove catalytic converters, change the ECU software, or alter boost levels will void the factory powertrain warranty for related failures. Some owners choose to keep a separate stock ECU or use a piggyback module to maintain some warranty coverage, but most serious builds accept the warranty void.

Installation Process Overview

Installing upgraded turbos on the G87 M2 is a major job. It typically involves removing the front bumper, intercooler, and coolant system components to access the turbos. The intake manifolds and charge pipes must be disconnected, and the oil supply and return lines need to be removed. On some aftermarket kits, the engine may need to be lifted or partially removed to access the lower turbo bolts. Expect a professional shop to spend 15–25 hours on the install, depending on the kit and any additional work being done simultaneously (e.g., intercooler, downpipes).

After installation, a break-in procedure is often recommended — typically 500–1,000 miles at low boost with varying engine speeds — before the final tuning session. This allows the turbo bearings to seat and ensures no oil leaks develop.

Conclusion: Is a Turbo Upgrade Worth It?

For G87 M2 owners who want to unlock the S58’s full potential, a turbocharger upgrade is the single most effective modification for dramatic power gains. The cost is significant, ranging from a few thousand dollars for a mild upgrade to well over $15,000 for a 900 whp monster. But the driving experience transforms completely — the car pulls harder throughout the rev range, feels more responsive on the street, and becomes a genuine track-day weapon.

Before jumping in, evaluate your goals: if you simply want a stronger daily driver, a stock replacement upgraded turbo with a good tune offers a balanced mix of power, reliability, and cost. If you are chasing big numbers and track times, a full aftermarket system with all supporting mods is the path, but be prepared for higher maintenance and reduced drivability. No matter which route you choose, invest in a quality tune and a trusted installer. The G87 M2 rewards well-planned upgrades with breathtaking performance.

For further reading, check out BimmerPost G87 forums for owner experiences, Pure Turbos for product details, and Bootmod3 for tuning platform information.