Looking for the most complete, best-fitting twin turbo system on the market without the price tag of a one-off custom build? Speed Engineering's twin turbo kit pairs Precision 62mm turbochargers with a full stainless 1-3/4" forward facing turbo header system, twin 2.5" cold side piping into a single 3" engine inlet, and an air-to-air intercooler system. Choose between an optional Y-pipe connection to your factory exhaust or the Speed Engineering true dual X-pipe kit at checkout.
This kit has been tested across multiple LS truck platforms. A stock 6.0L LQ4 with a 224 camshaft made 495 RWHP on 5 lbs of boost on a Mustang 1100MD dyno. A stock 4.8L with a 224 camshaft made 710 RWHP on 18 lbs of boost. A built 6.0L with heads and cam made 750 RWHP on 15 lbs of boost, climbing to 800 RWHP on 18 lbs.
The kit's sizing allows quick spool time on a stock displacement engine while leaving plenty of headroom to turn up the boost as your build progresses.
⚠️ Important Notes:
- No fuel system or calibration/tuning included — these must be sourced separately
- Requires the 2003-13 large 6.0L radiator (27-1005) and electric fans (27-1006)
- No drivetrain warranty of any kind is provided with this kit
Kit Includes:
- 2x Precision 62mm Turbochargers — 62mm turbines, T3 flange, .85 A/R exhaust housing
- Full 3" Exhaust Tubing
- 1-3/4" Forward Facing Turbo Headers
- Twin 2.5" Cold Side Piping into Single 3" Engine Inlet
- Air-to-Air Intercooler System
- 50mm Blow-Off Valves
- 44mm Wastegates
- Stainless Heat Shields
- Black Anodized AN Fittings/Lines
- All V-Bands & Clamps
- Vacuum Manifold and Hoses
- Air Filters
- IAT Sensor & Harness
- Oil & Water Billet Adapter Plates
- Optional Y-Pipe to Factory Exhaust OR True Dual X-Pipe Kit (select at checkout)
- 1 Year Manufacturing Warranty
Features:
- Precision 62mm Turbochargers — 62mm turbines, T3 flange, .85 A/R exhaust housing
- 1-3/4" Forward Facing Turbo Headers — Full stainless steel construction
- Air-to-Air Intercooler System — Efficient charge cooling
- 50mm Blow-Off Valves & 44mm Wastegates — Properly sized for the kit's power potential
- Twin 2.5" Cold Side / Single 3" Inlet Configuration
- Stainless Heat Shields Included
- Quick Spool on Stock Displacement — Sized to provide responsive power delivery while leaving room to scale boost
- Tested and Dyno Proven — Multiple LS engine configurations with documented results
- Compatible with 4.8L, 5.3L, and 6.0L LS Engines
- V8 Engines Only
Vehicle Applications:
Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 1999 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2000 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2001 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2002 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2003 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2004 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2005 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2006 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 1999 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2000 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2001 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2002 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2003 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2004 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2005 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
- 2006 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L
FAQ
How much power has this kit made on the dyno?
This kit has been tested on multiple applications. A stock 6.0L LQ4 with a 224 camshaft made 495 RWHP on 5 lbs of boost. A stock 4.8L with a 224 camshaft made 710 RWHP on 18 lbs of boost. A built 6.0L with heads and cam made 750 RWHP on 15 lbs of boost and 800 RWHP on 18 lbs.
What cooling system upgrades does this kit require?
This kit requires the 2003-13 large 6.0L radiator (27-1005) and electric fans (27-1006).
Does this kit include a fuel system or tuning?
No. A fuel system and calibration/tuning are not included and must be sourced separately to properly support the power level you're targeting.
What turbochargers does this kit use?
Precision 62mm turbochargers with 62mm turbines, a T3 flange, and a .85 A/R exhaust housing.
What exhaust connection options are available?
You can choose between an optional Y-pipe connection to your factory exhaust, or the Speed Engineering true dual X-pipe kit, selected at checkout.
Is a drivetrain warranty included?
No. This kit does not provide any drivetrain warranty of any kind. A 1-year manufacturing warranty is included on the kit components themselves.
What size headers come with this kit?
1-3/4" forward facing turbo headers are included, built from full stainless steel construction.
Is this kit street legal?
No. This is a race-only product intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).