Turbo Kit T70 T4 FOR Silverado Sierra: Complete Performance Upgrade Review

After spending considerable time researching and evaluating turbo upgrades for GM’s venerable Vortec V8 platform, we’ve found that the T70 T4 Turbo Kit represents one of the most comprehensive forced induction solutions available for 1999+ Silverado and Sierra trucks. Whether you’re running the 4.8L, 5.3L, or 6.0L LS-based engine, this kit promises substantial power gains without breaking the bank or requiring extensive fabrication skills.

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Why We Recommend This Turbo Kit for Your GM Truck

The LS engine family has earned a legendary reputation for reliability and modification potential, but factory naturally-aspirated power can feel limited when towing heavy loads or seeking spirited performance. This T70 T4 turbo kit addresses those limitations directly, offering a complete bolt-on solution that transforms your truck’s power delivery across the entire RPM range.

What immediately caught our attention during our evaluation was the kit’s comprehensiveness. Unlike budget turbo offerings that leave you hunting for additional components, this package includes virtually everything needed for installation—from the turbocharger itself to manifolds, downpipes, and essential hardware. This all-in-one approach significantly reduces installation headaches and hidden costs.

Unboxing and First Impressions: Quality You Can See

When examining the components, several quality indicators stood out. The T70 turbocharger features a sturdy T4 flange connection and robust internal construction designed to handle the boost pressures these engines can safely manage. The turbine housing showed clean casting work without the rough edges or poor finishing we’ve encountered with bottom-tier import turbos.

The included turbo manifolds deserve special mention. Constructed from thick-gauge stainless steel, these manifolds exhibited solid welding throughout—critical for long-term durability when subjected to extreme exhaust temperatures. The flanges sat flat against a reference surface during our inspection, suggesting proper manufacturing tolerances that should minimize exhaust leaks during installation.

Complete Kit Components

• T70 Turbocharger: Center Housing Rotating Assembly (CHRA) with balanced internals
• T4 Turbo Manifolds: Heavy-duty stainless steel construction for both cylinder banks
• Downpipe: Pre-fabricated exhaust routing from turbo to existing exhaust system
• Oil Feed Line: Braided stainless steel for reliable lubrication delivery
• Oil Return Line: Adequate sizing to prevent oil backup and seal failure
• Wastegate: External wastegate for precise boost control
• V-Band Clamps: Professional-grade connections for leak-free sealing
• Gaskets and Hardware: Complete mounting bolt kit and gaskets

Performance Capabilities: Real-World Power Gains

The T70 designation refers to the compressor wheel inducer diameter (approximately 70mm), positioning this turbo in the medium-frame category. For Vortec LS applications, this sizing hits a sweet spot—large enough to support 450-600 horsepower depending on your specific engine and supporting modifications, yet small enough to provide responsive boost buildup that doesn’t leave you waiting for power.

Based on data from similar builds and dyno results we’ve analyzed, here’s what you can realistically expect with proper tuning and supporting modifications:

Note: These figures assume 6-10 PSI boost with proper fueling, tuning, and supporting modifications. Individual results will vary based on engine condition, elevation, and specific build choices.

Installation Considerations: What You Need to Know

While marketed as a “bolt-on” kit, it’s important to set realistic expectations about the installation process. This isn’t a simple weekend project if you’re unfamiliar with forced induction systems. From our assessment of the components and installation requirements, here’s what you should know:

Moderate to Advanced Skill Level Required

The installation demands comfort working with exhaust systems, oil system modifications, and custom routing for intake piping. You’ll need to drill and tap your oil pan for the return line, source an appropriate oil feed location, and potentially modify your intake system to accommodate the turbo’s inlet configuration.

Expect 15-25 hours of installation time if you’re experienced with automotive modifications, potentially longer for first-time turbo installers. Having a lift makes the job significantly easier, though it can be accomplished with jack stands and patience.

Essential Tools and Equipment

• Comprehensive socket set (metric and standard)
• Torque wrench for critical fasteners
• Cutting tools for exhaust modification
• Drill and tap set for oil return installation
• Jack stands or vehicle lift
• Basic welding equipment (or access to a welder for custom work)

Supporting Modifications: Maximize Your Investment

To safely achieve the power levels this turbo kit enables, several supporting modifications are strongly recommended, if not absolutely necessary:

Fuel System Upgrades

Your stock fuel pump and injectors simply cannot deliver sufficient fuel for turbocharged power levels. Budget for larger fuel injectors (42-60 lb/hr depending on power goals) and a higher-flow fuel pump. Fuel system inadequacy is the most common cause of lean conditions that destroy engines under boost.

Engine Management and Tuning

This cannot be overstated: Professional tuning is absolutely mandatory. Your factory PCM programming expects naturally-aspirated airflow and fuel requirements. Without proper calibration for boost, ignition timing, and fuel delivery, you risk catastrophic engine damage. Plan to invest in either a standalone engine management system or work with a reputable tuner experienced with boosted LS applications.

Additional Recommendations

• Boost Controller: For precise boost management beyond the included wastegate
• Wideband O2 Sensor: Essential for monitoring air-fuel ratios during tuning
• Upgraded Clutch (Manual Transmission): Stock clutches won’t survive the increased torque
• Transmission Upgrades (Automatic): Consider valve body upgrades and torque converter for longevity
• Intercooler: