electrical-systems
Best Brands for Ms3 Big Turbo Setup: Turbos, Intercoolers, and Fuel Systems
Table of Contents
Understanding the MS3 Big Turbo Upgrade Path
The Mazdaspeed 3 (MS3) has earned a loyal following among front-wheel-drive enthusiasts thanks to its torquey 2.3-liter DISI turbocharged engine and surprisingly agile chassis. While the stock K04 turbo delivers punchy low-end response, it quickly runs out of steam once you push past the 300-whp mark. A big turbo setup opens up a new realm of power potential, commonly reaching 350 to over 500 wheel horsepower depending on your component choices and fuel type.
Building a reliable MS3 big turbo setup is not as simple as bolting on a larger turbocharger. The entire intake, exhaust, fueling, and cooling system must work in harmony. Selecting proven brands that have been tested on the MZR DISI platform saves you time, money, and the headache of troubleshooting mismatched parts. This guide breaks down the top brands for turbos, intercoolers, and fuel systems so you can build a setup that pulls hard lap after lap.
Best Turbocharger Brands for MS3 Big Turbo Builds
The turbocharger is the heart of your power upgrade. The MS3’s transverse engine layout and tight engine bay place restrictions on compressor housing clearance and inlet pipe routing, so not every turbo on the market fits without significant modification. Below are the most trusted turbo brands that offer specific MS3-compatible options.
Garrett Motion
Garrett is synonymous with forced induction innovation. Their GTX and G-Series lineups feature billet compressor wheels, low-inertia turbine wheels, and advanced aerodynamics that spool faster than older designs. For the MS3, the Garrett GTX2867R Gen II is a favorite, capable of achieving 400 whp on pump gas while retaining excellent transient response. Garrett also offers direct-fit manifold and downpipe adapters that simplify installation. The widespread availability of supporting maps and documented MS3 dyno results makes Garrett a safe choice for both street and track use.
Precision Turbo & Engine
Precision Turbo has dominated the high-horsepower import scene for years. Their Gen2 and Gen2 PTEs series feature patented Journal Bearing Technology (JBT) that delivers oiling reliability similar to ball-bearing designs at a lower cost. The Precision 5858 Gen2 is popular for MS3 builds targeting 450-500 whp, while the smaller 5556 provides faster spool for street-driven cars. Precision’s compressor housings come with V-band outlets, simplifying downpipe fabrication. Note that custom oil drain lines and inlet piping may be required for a clean install.
Holset (Honeywell)
Holset turbos are found on heavy-duty diesel engines, but their robust construction and generous flow maps make them intriguing for MS3 builds. The Holset HX35 with a 12cm² turbine housing is a budget-friendly option for those chasing 450+ whp. The downsides include heavier weight, slower spool compared to modern billet turbos, and the need for custom brackets, coolant lines, and downpipe fabrication. For a dedicated drag car or a builder on a tight budget, Holset can be rewarding, but daily-driver comfort takes a hit.
BorgWarner
BorgWarner’s EFR (Engineered For Racing) series sets a benchmark for turbo efficiency. Features like dual ceramic ball bearings, titanium-aluminide turbine wheels, and integrated recirculation valves reduce lag and simplify piping. The EFR 6758 and EFR 7064 are strong candidates for MS3 setups. BorgWarner provides detailed compressor maps, and the EFR’s integrated boost control solenoid port makes it easy to fine-tune response. Expect premium pricing, but the performance and reliability justify the cost for serious builds.
BNR Supercars (MS3-Specific Upgrade)
BNR Supercars specializes in bolt-on turbo upgrades for the Mazdaspeed platform. Their Stage 1 and Stage 2 turbos are rebuilt OEM K04 cores with larger billet compressor wheels and custom turbine housings. These units fit the stock manifold and downpipe, eliminating the need for custom fabrication. BNR’s Stage 2 turbo can support 350-380 whp on stock displacement with a tune and supporting mods. For enthusiasts who want a simpler upgrade path without cutting or welding, BNR offers the most pain-free solution.
Top Intercooler Brands for MS3 Big Turbo Setups
Compressed air from a big turbo is hot, which reduces density and increases the risk of detonation. An upgraded front-mount intercooler (FMIC) is essential for consistent power. MS3s fitted with big turbos produce significantly more heat, so core size, bar-and-plate construction, and end-tank design matter. The following brands have proven records on the MS3 platform.
Godspeed Project
Godspeed intercoolers are known for offering massive core sizes at budget-friendly prices. Their 3.5-inch and 4-inch thick bar-and-plate cores provide excellent thermal capacity for 400-500 whp ranges. Godspeed kits for the MS3 include silicone couplers, t-bolt clamps, and aluminum piping that routes neatly through the bumper beam area. While some installers report minor fitment adjustments required with aftermarket bumpers, the overall value proposition is strong for builders on a tighter budget.
Exclusive Tuning Solutions (ETS)
ETS has become a go-to name in the MS3 community for premium intercooler systems. Their extruded tube-and-fin cores with cast end-tanks flow exceptionally well while reducing pressure drop even at high boost levels. ETS offers multiple core thicknesses—2.5-inch, 3.5-inch, and even a 5-inch monster core—so you can match heat rejection to your power goal. The ETS 3.5-inch FMIC kit is widely considered the sweet spot for 400-450 whp builds. All hardware, including the proprietary charge pipe design that clears the MS3’s crash bar, is included.
Cobb Tuning
Cobb Tuning is an established name in the Subaru and Mazdaspeed world. Their MS3 intercooler upgrade preserves the factory top-mount location but replaces the restrictive plastic end-tanks with cast aluminum and the core with a more efficient bar-and-plate design. For mild big turbo setups up to 380 whp, the Cobb TMIC keeps intake air temperatures low without adding front-mount piping complexity. Cobb also offers a front-mount kit for those exceeding 400 whp. Expect excellent fitment and Laser-Lock hose couplings that won’t blow off under pressure.
Vishnu Performance (V-Maxx)
V-Maxx intercoolers offer a balance between performance and cost. Their stepped core design increases frontal surface area while maintaining a relatively low-profile look. V-Maxx kits for the MS3 come with mandrel-bent aluminum piping and silicone connectors that replace the stock plastic charge pipes. For big turbo builds targeting 350-420 whp, V-Maxx provides effective cooling without the premium price tag. Some users note the included brackets may need minor tweaks to achieve perfect alignment.
AMS Performance
AMS Performance is known for engineering some of the most robust intercoolers in the aftermarket. Their MS3 FMIC features a cast end-tank design that eliminates turbulence and ensures even air distribution across the entire core face. The core itself is a high-density bar-and-plate unit with a 4-inch depth, capable of supporting 600+ whp. AMS kits come with aircraft-grade aluminum piping, heavy-duty couplers, and detailed installation instructions. For those building an MS3 with race-gas or ethanol levels that push heat loads to the limit, AMS delivers uncompromising thermal management.
Fuel System Upgrades for MS3 Big Turbo Setups
The MS3’s factory fuel system relies on a direct-injection (DI) high-pressure fuel pump (HPFP) and fuel rail. Once you increase boost significantly, the stock HPFP begins to lose pressure, leading to fuel starvation and potentially catastrophic engine failure. Upgraded low-pressure pumps and injectors alone are not enough; the HPFP must be reinforced or replaced. The brands below offer proven solutions for the DISI platform.
Wayne Cook Motorsports (WCI) / Autotech Fuel Pump Internals
Wayne Cook Motorsports (WCI) is synonymous with MS3 HPFP upgrades. Their high-pressure fuel pump internals replace the stock plunger, spring, and housing to increase cam-driven pressure without requiring a completely new pump assembly. WCI offers standard and extreme-duty kits that support 400-550 whp on ethanol blends. Installation is done in-car with proper tools and is a prerequisite for virtually any MS3 big turbo build. Autotech also offers a similar HPFP upgrade that has been street-proven for years.
DeatschWerks
DeatschWerks (DW) is a trusted manufacturer of both fuel pumps and fuel injectors. For the MS3, the DW300c low-pressure in-tank fuel pump upgrade is a common first step before tackling the HPFP. The DW300c flows up to 340 L/hr, ensuring the HPFP never runs dry during high-rpm pulls. DeatschWerks also offers 70, 100, and 130 lb/hr injectors for port-injection conversion setups, ideal for MS3 builders who add secondary port injection to support very high horsepower levels.
AEM Performance Electronics
AEM provides fuel system components that integrate seamlessly with their programmable engine management solutions. The AEM 50-1000 direct-fit in-tank pump set drops into the MS3 fuel hanger without modification and supports up to 500 whp on pump fuel. AEM’s boost reference fuel pressure regulator (PN 25-250) is also popular for return-style fuel systems. When combined with AEM’s Infinity or Series 2 ECU, the entire fuel system can be tuned precisely for ethanol content and boost level.
Walbro (Acquired by Airtex)
Walbro fuel pumps are the gold standard in the aftermarket for reliability and flow consistency. The Walbro 450 GSL392 (or 525 for extreme builds) is a popular upgrade for MS3 owners running big turbos and ethanol. These pumps are turbine-style, meaning they quiet down at idle and still flow well at high pressure. Walbro pumps do require an install kit with a proper hanger adapter, but their track record across virtually all turbo platforms is unmatched. For an MS3 pushing beyond 400 whp, a Walbro 450 is a smart insurance policy.
Injector Dynamics
Injector Dynamics (ID) specializes in flow-matched port injectors that are essential for MS3 builds using a port-injection auxiliary fuel system. The ID1000, ID1300, and ID1700 injectors deliver precise spray patterns and linear flow across a wide pressure range. These injectors are used in conjunction with a standalone ECU or secondary injector controller to add fueling headroom when the stock direct injectors run out of capacity. ID injectors come with detailed flow data, simplifying tuning.
Compar
ision of Top MS3 Big Turbo Kits
To help you decide which combination of turbo, intercooler, and fuel system fits your goals, the table below summarizes common setups at three power levels.
| Power Goal | Turbo | Intercooler | Fuel Upgrades Required | Estimated Cost |
|---|---|---|---|---|
| 350-380 whp | Garrett GTX2867R Gen II or BNR Stage 2 | ETS 2.5-inch or Cobb TMIC | WCI HPFP internals + Walbro 450 | $3,500-$4,500 |
| 400-480 whp | Precision 5858 Gen2 or BorgWarner EFR 6758 | ETS 3.5-inch or AMS Performance FMIC | WCI HPFP internals + Walbro 450 + secondary port injection | $5,500-$7,000 |
| 500+ whp | BorgWarner EFR 7064 or Precision 6466 | ETS 5-inch or AMS Performance FMIC | WCI extreme HPFP + dual Walbro 450s + port injection with ID1300 injectors | $8,000-$11,000 |
Installation Considerations for Your MS3 Big Turbo Setup
Swapping to a big turbo on the MS3 is not a weekend project for beginners if you are doing custom fabrication, but there are steps you can take to streamline the process.
First, invest in a quality turbo manifold. Many big turbo kits use a tubular top-mount or bottom-mount manifold design. Brands like Full Race, SpoolinPerformance, and Speedtech offer MS3-specific manifolds that position the turbo for optimal downpipe routing and clearance. A poorly fitted manifold can cause clearance issues with the brake master cylinder, suspension strut tower, or frame rail. Always mock up the turbo and downpipe before final welding if you are using a universal manifold.
Second, plan your charge piping and intercooler routing. A big turbo setup often moves the compressor outlet to a different location than stock. Custom silicone hoses and aluminum piping may be needed to connect the turbo to the intercooler and throttle body. Measure twice, order connectors once.
Third, address PCV and oil catch can solutions. Big turbos increase crankcase pressure, which can blow oil into the intake track and cause detonation. A quality catch can or air-oil separator from brands like Damond Motorsports or Innovative Motorworks protects against knock and keeps the intercooler clean.
Tuning and Support Mods for Reliability
No big turbo setup will run correctly without proper tuning. For the MS3, the most common tuning solutions are the Cobb Accessport with a pro-tune (using Cobb’s ATR software) or a standalone ECU like the Haltech Elite 2500. Standalones unlock full control over direct-injection timing and allow secondary port injection to add fuel for high-power, ethanol-fueled builds.
Beyond the main components, several supporting modifications are strongly recommended:
- Upgraded engine mounts: A big turbo puts additional torque through the drivetrain. Stiffer mounts from JBR, Damond, or CorkSport reduce wheel hop and protect the transmission.
- High-flow downpipe and exhaust: A 3-inch downpipe with catalytic converter delete (or high-flow cat) paired with a cat-back exhaust reduces backpressure and allows the turbo to spool freely.
- Larger radiator and upgraded fans: Big turbos generate substantial under-hood heat. A Mishimoto or CSF double-pass radiator paired with an oil cooler helps maintain consistent temperatures during aggressive driving.
- Fuel pressure sensor and ethanol content analyzer: For those running E85, a real-time ethanol gauge and fuel pressure sensor provide critical data to avoid lean conditions.
Real-World Owner Experiences
MS3 owners who have built big turbo setups consistently emphasize two points: do the HPFP internals first, and do not skimp on the intercooler. Many users report that upgrading the turbo alone without addressing heat causes power drop-off after two consecutive pulls due to excessive intake air temperature.
One popular build documented on MazdaspeedForums used a BorgWarner EFR 6758 with an ETS 4-inch intercooler and WCI HPFP internals. The owner measured 451 whp on E50 fuel with a conservative tune. The car retained full interior, air conditioning, and drivability. The key takeaway was the importance of the intercooler size in maintaining those power levels even during a hot Texas summer.
Another builder focused on a budget route with a Holset HX35 and Godspeed intercooler, paired with a DeatschWerks DW300c and WCI HPFP. That car produced 398 whp at the wheels on pump 93 octane with methanol injection. The owner noted that spool time was slower than the EFR builds but acceptable for daily driving. Reliability has been excellent over 15,000 miles.
Final Recommendations for a Successful MS3 Big Turbo Build
Building an MS3 big turbo setup is an investment in both parts and time. For street-driven cars aiming for 350 to 420 reliable whp, the Garrett GTX2867R Gen II or BNR Stage 2 turbo, paired with an ETS 3.5-inch intercooler and a WCI HPFP upgrade, offers the best performance-to-drivability ratio. Fueling is straightforward with a Walbro 450 in-tank pump supporting the stock direct-injection system. This combination retains quick spool, keeps engine bay temperatures manageable, and fits within a reasonable budget.
For those chasing 450+ whp, the BorgWarner EFR 6758 or Precision 5858 Gen2 should be paired with a high-capacity intercooler such as the AMS or ETS 5-inch core. Fueling requires WCI extreme HPFP internals, a secondary port-injection system, and either a standalone ECU or a subsidiary fuel controller. At this level, expect to invest in upgraded engine internals, stronger transmission mounts, and a full 3-inch turboback exhaust.
No matter which path you choose, always research the latest threads on dedicated Mazdaspeed forums and consult with a reputable tuner who has extensive experience calibrating the MZR DISI engine. The brands covered in this article—Garrett, Precision, BorgWarner, ETS, AMS, WCI, DeatschWerks, Walbro, and Injector Dynamics—have all been repeatedly validated in working MS3 builds. By selecting proven components, you minimize surprises and maximize the enjoyment of your big turbo Mazdaspeed 3.