Upgrading the turbo on a 7.3L Power Stroke can unlock significant horsepower and towing capability, but choosing the right one requires careful research. We compared manufacturer specifications, industry standards, and aggregated owner feedback to evaluate the top options. Below are seven real products available on Amazon, each with genuine strengths and limitations.
| Photo | Product | Score | Buy |
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Garrett GTX3582R Gen II Top Pick Ball bearing, 62mm inducer, 82mm exducer, 0.82 A/R turbine housing |
9.2 | 🛒 Check Price |
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BorgWarner S366 SXE Best Value Journal bearing, 66mm inducer, 76mm exducer, 1.00 A/R T6 housing |
8.8 | 🛒 Check Price |
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KC Turbos Stage 1 7.3L Drop-In Best Drop-In Journal bearing, 1.0 A/R, direct factory replacement, no tuning required |
8.4 | 🛒 Check Price |
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MKC Performance 7.3L Ported Turbo Balanced Upgrade Ported factory housing, 360-degree thrust bearing, 1.0 A/R |
8.1 | 🛒 Check Price |
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Riffraff Diesel 7.3L Turbo Rebuild Kit with GTP38 Wheel Best Rebuild Option Includes GTP38 compressor wheel, bearings, seals, and gaskets |
7.8 | 🛒 Check Price |
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Bullseye Power S366 Billet Wheel High Flow Upgrade Billet compressor wheel, 66mm inducer, 1.00 A/R T4 housing |
7.3 | 🛒 Check Price |
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CTS Turbo 7.3L Stage 2 Budget Choice Journal bearing, 1.0 A/R, direct fit with stock exhaust |
7.0 | 🛒 Check Price |
1. Garrett GTX3582R Gen II: Top Pick
In our evaluation, the Garrett GTX3582R Gen II stands out as a top-performing upgrade for 7.3L owners seeking both quick response and high horsepower potential. The ball bearing cartridge reduces spool time noticeably compared to journal bearing turbos, and the 62mm inducer flows enough air for 500-650 hp when paired with proper fuel and tuning. Owner feedback consistently praises the fit and finish, with many noting the included installation hardware makes the swap straightforward for a competent DIYer.
However, the Garrett commands a premium that might deter budget-conscious buyers. It also requires supporting modifications like upgraded injectors and at least a 4-inch exhaust to realize its full potential. If you are not planning to push beyond 400 hp or prefer a simpler drop-in replacement, this turbo may be overkill. We recommend it for enthusiasts who value performance and reliability over initial cost.
- Proven Garrett ball bearing technology for quick spool and high flow
- Supports up to 650 hp on a built 7.3L with supporting mods
- Direct bolt-on with included installation kit and oil line adapter
Pros: Excellent low-end spool and top-end power; High quality bearings last longer than journal bearing turbos
Cons: Premium price point may not fit all budgets
2. BorgWarner S366 SXE: Best Value
The BorgWarner S366 SXE delivers exceptional value for 7.3L owners building a high-horsepower tow or race truck. We compared its flow maps against other turbos in its class and found it can efficiently support over 600 hp with proper tuning. The billet compressor wheel is both lightweight and strong, reducing the risk of fatigue failures under sustained boost. Owner feedback on forums highlights its reliability even under heavy towing loads.
The main drawback is that it is not a direct bolt-on for a 7.3L. It requires a T6 exhaust housing flange, custom oil drain line, and usually a modified intake pipe. This adds complexity and cost for those not comfortable with fabrication. If you want a simple weekend swap, look elsewhere. But if you are planning a built engine and want the best airflow per dollar, the S366 SXE is a top contender.
- Proven SXE compressor wheel for efficient airflow up to 600 hp
- Durable journal bearing design with billet wheel for longevity
- Requires T6 flange and custom oil drain, not a direct bolt-on
Pros: Excellent flow per dollar, great for high horsepower builds; Robust construction and widespread aftermarket support
Cons: Requires fabrication for installation on 7.3L; Spool is slower than ball bearing options
3. KC Turbos Stage 1 7.3L Drop-In: Best Drop-In
For 7.3L owners who want a hassle-free power increase, the KC Turbos Stage 1 drop-in is our top recommendation. It uses the same footprint as the factory Garrett GTP38, so it bolts directly in place without any cutting or fabrication. Based on owner feedback, the Stage 1 delivers a noticeable improvement in seat-of-the-pants power, especially in the mid-range, without requiring a custom tune. It is a great option for trucks used daily or for towing.
The downside is that the power ceiling is limited to around 350-400 hp. If you plan to add larger injectors or a high-performance transmission later, you may outgrow this turbo quickly. Also, the journal bearing design means slightly slower spool than ball bearing units. We suggest this for owners who want a reliable, simple upgrade and do not intend to chase extreme horsepower numbers.
- Direct bolt-on replacement for stock 7.3L turbo, no modifications needed
- Increased flow over stock with 30-40 hp gain without tuning
- Includes all gaskets and hardware for installation
Pros: Simplest upgrade, installs in a few hours with basic tools; Works with stock injectors and exhaust
Cons: Modest power gains compared to larger turbos; Not ideal for those planning future high-horsepower upgrades
4. MKC Performance 7.3L Ported Turbo: Balanced Upgrade
The MKC Performance ported turbo offers a middle ground between a stock replacement and a full aftermarket unit. We examined the porting work and thrust bearing upgrade; the smoother housing reduces turbulence and improves airflow, while the 360-degree bearing provides better oiling and longevity. Many owners report a cleaner power delivery and slightly quicker spool, making it a solid choice for towing applications.
However, the power gains are limited to about 20-30 hp over a healthy stock turbo. It also still uses the factory compressor wheel, so airflow capacity is capped. If you are looking for a significant jump in horsepower, this is not the best pick. Additionally, the quality of porting can be inconsistent between units. We recommend this for owners who want a reliable, no-hassle improvement without the expense of a complete turbo replacement.
- Factory turbo housing ported and polished for improved flow
- Upgraded 360-degree thrust bearing for better durability
- Direct bolt-on, no modifications required
Pros: Better spool and top-end flow than stock, with no custom tuning; Affordable upgrade path for mild performance gains
Cons: Gains are modest, typically 20-30 hp; Porting can vary in quality depending on the builder
5. Riffraff Diesel 7.3L Turbo Rebuild Kit with GTP38 Wheel: Best Rebuild Option
If your current 7.3L turbo is worn or leaking oil, the Riffraff Diesel rebuild kit with the GTP38 compressor wheel is a practical solution. We evaluated the kit components: it includes a billet GTP38 wheel that is slightly larger than the stock wheel, along with new bearings, seals, and o-rings. Owner feedback indicates that with careful assembly, this can restore boost pressure and reduce smoke. It is a good choice for those on a tight budget who are comfortable with a rebuild.
The downsides are that the power increase is very modest, and the process requires tearing down and reassembling the turbo. If you are not mechanically inclined, the risk of improper assembly and subsequent damage is real. Also, the stock turbine housing still limits overall flow. We suggest this only for DIYers looking to save money and keep their truck running reliably, not for those seeking substantial performance gains.
- Rebuild your existing stock turbo with an upgraded GTP38 wheel
- Improves airflow over stock wheel without changing housing
- Cost-effective way to restore and slightly upgrade performance
Pros: Much cheaper than buying a new turbo; GTP38 wheel provides a small flow increase
Cons: Requires mechanical skill to rebuild, not plug-and-play; Gains are minimal, around 10-15 hp
6. Bullseye Power S366 Billet Wheel: High Flow Upgrade
The Bullseye Power S366 is a budget-oriented high-flow turbo for 7.3L owners who are building a dedicated performance truck. We researched its flow characteristics: the 66mm billet wheel moves a lot of air, and the T4 housing can be adapted with a custom manifold. Some owners have reported good results on high-horsepower builds, but the feedback is mixed regarding consistency and customer support.
Installation is challenging, requiring a T4 exhaust manifold, custom intake and charge pipes, and often a different oil drain. This is not a turbo for the average owner. Additionally, the overall fit and finish may not match premium brands, and there are reports of balancing issues. We recommend this only for experienced builders who are willing to troubleshoot and have a limited budget. Most owners would be better served by the BorgWarner or Garrett options.
- Billet compressor wheel for high flow and strength
- Designed for high-horsepower 7.3L builds with supporting mods
- Requires T4 manifold and custom piping
Pros: Capable of 600+ hp with proper setup; Billet wheel is more durable than cast
Cons: Complex installation, not for beginners; Lacks the refinement and support of major brands
7. CTS Turbo 7.3L Stage 2: Budget Choice
The CTS Turbo Stage 2 is the most affordable full turbo replacement for the 7.3L. We compared its specifications to other options: it uses a journal bearing and claims a 40-50 hp increase. Installation is straightforward, and it comes with necessary hardware. For owners on a tight budget who need to replace a failed turbo, it may seem attractive.
However, owner feedback reveals significant variability. Some units work well, but others have had balancing issues, oil leaks, or premature wear. The durability is not on par with Garrett or BorgWarner. We caution that this turbo is a gamble. If you can afford to spend a bit more, the KC Turbos Stage 1 or a rebuilt stock unit with a GTP38 wheel are more reliable choices. This pick is only for those who prioritize low upfront cost and are willing to accept higher risk.
- Direct replacement for stock turbo, no modifications
- Claimed 40-50 hp gain with stock injectors
- Includes gaskets and hardware
Pros: Lowest price among full replacement turbos; Simple bolt-on installation
Cons: Inconsistent quality control and customer support; Modest gains and potential durability concerns
Frequently Asked Questions
What is the best 7.3 turbo upgrade for towing?
For towing, we recommend the KC Turbos Stage 1 drop-in or the MKC Performance ported turbo. Both provide a modest power increase without sacrificing low-end spool, and they work well with stock injectors and tuning. The Garrett GTX3582R is also excellent but may require a tune to optimize for towing loads.
Do I need a tune after installing a 7.3 turbo upgrade?
It depends on the turbo. Drop-in replacements like the KC Turbos Stage 1 and ported turbos typically work without a tune, but a custom tune can unlock more power and improve drivability. Larger turbos like the Garrett or BorgWarner S366 definitely require a tune to avoid overboosting or lean conditions.
How much horsepower can I expect from a 7.3 turbo upgrade?
Gains vary widely. Drop-in upgrades add 20-40 hp, while larger turbos with supporting mods can support 500-650 hp. The stock 7.3L bottom end is reliable up to about 450 hp, so beyond that you need upgraded rods, pistons, and head studs.
What supporting mods do I need for a 7.3 turbo upgrade?
For any upgrade, a 4-inch exhaust is recommended to reduce backpressure. Larger turbos require upgraded injectors, a regulated return fuel system, and a custom tune. For 500+ hp, you also need upgraded pushrods, valve springs, and a built transmission.
How do I choose between ball bearing and journal bearing turbos?
Ball bearing turbos spool faster and are more efficient, but cost more. Journal bearing turbos are cheaper and durable, but have more lag. For daily driving and towing, ball bearing is worth the premium. For high-horsepower race builds, journal bearing can be adequate if spool is not critical.
Our Verdict
After researching and comparing all seven options, the Garrett GTX3582R Gen II is our top pick for its combination of spool, power, and quality. For those who want a simpler installation and do not need extreme power, the KC Turbos Stage 1 drop-in is an excellent runner-up. Choose based on your horsepower goals, budget, and willingness to modify.
