Turbochargers have become indispensable for extracting maximum performance from modern engines, and the 2.7T engine family is no exception. Most commonly associated with the Audi and Volkswagen 2.7L twin-turbo V6 (found in the B5 S4, C5 A6 2.7T, and allroad), this compact but robust engine responds exceptionally well to forced induction upgrades. Whether you are chasing daily drivability, track-ready response, or all-out horsepower, selecting the right turbocharger is the single most impactful modification you can make. This article reviews the top five turbochargers for 2.7T applications, comparing brands, sizes, performance benchmarks, and real-world characteristics. We also cover selection criteria and supporting modifications to help you build a reliable, high-output setup.

Understanding Turbocharging for the 2.7T Engine

The 2.7T engine is a 90-degree V6 with dual Garrett T25 or K03 turbos in stock form. These factory units are efficient for daily driving but quickly become bottlenecks when tuning for higher horsepower. Aftermarket turbochargers offer larger compressor wheels, improved aerodynamics, and better heat management. Key metrics like A/R (area/radius) ratio, trim, and wheel diameter define how a turbo spools and flows. For the 2.7T, single-turbo conversions are also popular, eliminating the complexity of twin-turbo plumbing. However, many enthusiasts retain a twin-turbo layout for even power delivery and faster spool. Each turbo featured here is suitable for either single or twin setups, with emphasis on compatibility with typical 2.7T exhaust manifolds and downpipes.

Top 5 Turbochargers for 2.7T Engines

1. Garrett GT28RS Turbocharger

The Garrett GT28RS, also known as the “Disco Potato,” is a legendary upgrade for the 2.7T community. Its ball-bearing center section provides lightning-fast spool and minimal lag, making it ideal for street-driven cars that need instant response. With a 0.64 A/R turbine housing, the GT28RS is optimized for low- and mid-range torque. Many tuners pair it with standard K04 or T25 flanges, simplifying installation on twin-turbo 2.7T manifolds.

  • Brand: Garrett Motion
  • Size: 0.64 A/R turbine housing, 52mm compressor inducer
  • Performance Benchmark: Up to 400 horsepower per turbo (twin setup ~800+ hp capable at high boost)
  • Applications: Daily drivers, autocross, street performance
  • Notable Feature: Dual ball bearing technology for low inertia and long life

For more technical details, visit the Garrett GT28RS product page.

2. BorgWarner EFR 7670 Turbocharger

The BorgWarner EFR 7670 represents a step up in technology with its gamma-Ti turbine wheel and integrated cast wastegate. This turbocharger is remarkably responsive while supporting over 500 horsepower per unit. The 0.64 A/R turbine housing helps the EFR 7670 spool quickly, and its compact design fits well in tight engine bays. A unique feature is the integrated blow-off valve and wastegate, simplifying charge piping and reducing boost leaks. For 2.7T builds aiming for 600–800 whp on twin setups, the EFR 7670 is a top contender.

  • Brand: BorgWarner
  • Size: 0.64 A/R turbine housing, 67mm compressor wheel
  • Performance Benchmark: Up to 550 horsepower per turbo
  • Applications: High-performance street, track days, time attack
  • Notable Feature: Gamma-Ti turbine wheel resists cracking and reduces rotational inertia

Learn more from BorgWarner’s EFR series documentation.

3. Precision Turbo PT5862 Turbocharger

For builders targeting serious power numbers, the Precision Turbo PT5862 offers monstrous airflow. Its 0.82 A/R turbine housing favors top-end power, making it best suited for race applications or highway pulls. The PT5862 uses a journal bearing center section, which is more affordable but requires proper oil cooling. When paired with a 2.7T engine built to handle 700+ hp on a twin setup, this turbo delivers exceptional compressor efficiency. It is a common choice for single turbo conversions as well.

  • Brand: Precision Turbo & Engine
  • Size: 0.82 A/R turbine housing, 62mm compressor wheel
  • Performance Benchmark: Up to 600 horsepower per turbo
  • Applications: Drag racing, high-boost street cars, competition
  • Notable Feature: High-flow compressor cover and robust cast iron turbine housing

See the PT5862 on the Precision Turbo website.

4. Turbonetics GTK550 Turbocharger

The Turbonetics GTK550 bridges the gap between quick spool and high power. With a 0.70 A/R turbine housing, it offers a balanced compromise between response and top-end flow. The GTK550 uses a journal bearing but with high-quality internals that survive sustained high boost. Many 2.7T owners appreciate its drop-in design for T25 flanges and the ability to exceed 500 hp per turbo without excessive lag. It is an excellent option for those who want more than a GT28RS but are not ready for the huge housings of a PT5862.

  • Brand: Turbonetics
  • Size: 0.70 A/R turbine housing, 60mm compressor wheel
  • Performance Benchmark: Up to 550 horsepower per turbo
  • Applications: Street/strip, weekend racing, high-performance street
  • Notable Feature: Optimized for 2.0–3.0L engines with quick spool characteristics

Visit Turbonetics for more on the GTK550 turbocharger.

5. Holset HE351CW Turbocharger

Originally designed for heavy‑duty diesel engines, the Holset HE351CW has been adopted by the 2.7T community for its exceptional durability and low cost. With a 0.60 A/R turbine housing, it spools quickly for its flow capacity. The HE351CW is often used in single-turbo conversions due to its robust bearing system and ability to handle high exhaust gas temperatures. While peak horsepower is lower than the PT5862, it delivers reliable 400 hp per turbo with room to grow. For budget-conscious builders, this is an excellent choice.

  • Brand: Holset (part of Cummins)
  • Size: 0.60 A/R turbine housing, 60mm compressor inducer
  • Performance Benchmark: Up to 400 horsepower per turbo
  • Applications: Budget builds, single-turbo conversions, daily drivers
  • Notable Feature: VGT (variable geometry) capable, though many use the fixed geometry version

Learn about Holset turbos at Holset official page.

Comparison Table: 2.7T Turbocharger Specifications

Turbocharger Brand A/R Turbine Housing Max HP (per turbo) Bearing Type Typical Twin Setup Power
Garrett GT28RS Garrett Motion 0.64 400 hp Ball bearing 700–800 whp
BorgWarner EFR 7670 BorgWarner 0.64 550 hp Ball bearing 800–1000 whp
Precision PT5862 Precision Turbo 0.82 600 hp Journal bearing 1000+ whp
Turbonetics GTK550 Turbonetics 0.70 550 hp Journal bearing 800–950 whp
Holset HE351CW Holset 0.60 400 hp Journal bearing 700–800 whp

How to Choose the Right Turbocharger for Your 2.7T

Selecting the best turbo depends on your goals, budget, and tolerance for lag. Here are key factors to consider:

  • Power Targets: If you aim for 400–500 whp, the GT28RS or HE351CW is sufficient. For 500–700 whp, the EFR 7670 or GTK550 shine. Above 700 whp, the PT5862 or moving to a single large turbo makes sense.
  • Spool vs. Top‑End: Lower A/R numbers (0.60–0.64) give faster spool but restrict top‑end flow. Higher A/R (0.70–0.82) delay boost but yield more peak power. For street use, 0.64–0.70 A/R is recommended.
  • Budget: Holset and journal bearing turbos are cheaper, while ball bearing units like the GT28RS or EFR series cost more but offer better response and durability.
  • Single vs. Twin: A single turbo conversion simplifies piping but increases lag. Twin turbos retain factory exhaust routing and provide quicker spool at the cost of complexity.
  • Supporting Mods: Higher boost requires upgraded fuel system (larger injectors, high‑flow fuel pump), intercooler, and exhaust. Engine internals may need forged rods and pistons above 600 whp.

Installation and Supporting Modifications

Upgrading the turbochargers on a 2.7T is not a bolt‑on affair for most options. Consider the following:

  • Exhaust Manifolds: Many aftermarket turbos use T3 or T4 flanges, requiring adapter plates or custom manifolds. The GT28RS uses T25 flanges, making it a direct fit for factory manifolds.
  • Downpipes: Larger turbos require 2.5‑inch or 3‑inch downpipes to reduce backpressure. A quality stainless steel set is recommended.
  • Intercooling: Increased boost raises charge air temperatures. A larger front‑mount intercooler (FMIC) or upgraded side‑mounts are essential for consistent power.
  • Fuel System: 440cc injectors are standard for stock 2.7T, but 550cc or larger are needed for 400+ whp. A Walbro 255 lph fuel pump is a common upgrade.
  • Engine Management: Reflash or stand‑alone ECU tuning is mandatory to optimize air‑fuel ratios, timing, and boost control. Popular options include ME7.1 tuning via NefMoto, Maestro, or standalone ECUs like the Haltech or Link.
  • Oil and Cooling: Journal bearing turbos need proper oil supply and restrictors. Ball bearing units benefit from a clean oil feed. Upgraded oil coolers prevent heat soak.

Always consult a reputable 2.7T specialist or tuning shop before undertaking major upgrades.

Final Thoughts

The 2.7T engine is a rewarding platform for turbo upgrades, with many options to match any power goal. For daily street use with quick response, the Garrett GT28RS or BorgWarner EFR 7670 are excellent. If you want extreme power for competition, the Precision PT5862 or Turbonetics GTK550 deliver. Budget builds can rely on the Holset HE351CW without sacrificing reliability. Whichever you choose, invest in proper supporting modifications and professional tuning to unlock the full potential of your 2.7T. Remember, a turbocharger is only as good as the system it is paired with.