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
Frequently Asked Questions:
Q: 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.
Q: 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).
Q: 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.
Q: What turbochargers does this kit use?
Precision 62mm turbochargers with 62mm turbines, a T3 flange, and a .85 A/R exhaust housing.
Q: 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.
Q: 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.
Q: What size headers come with this kit?
1-3/4" forward facing turbo headers are included, built from full stainless steel construction.
Q: 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).